Patent Publication Number: US-9421421-B2

Title: Golf club with improved weight distribution

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application is a Continuation in Part of U.S. patent application Ser. No. 14/214,025, filed Mar. 14, 2014, the disclosure of which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present technology generally relates to systems, devices, and methods related to golf clubs, and more specifically to golf clubs with improved weight distribution. 
     DESCRIPTION OF THE RELATED TECHNOLOGY 
     In order to create golf clubs that help the golfer achieve a better score, golf club designers have made numerous technological advancements in creating a golf club that is easier to hit. Technological advances such as metalwood drivers, cavity back irons, and even graphite shafts have all made the game of golf much easier for the average golfer by helping them hit the golf ball longer and straighter. However, despite all the technical advancements in the game of golf, the biggest variation in a golf swing is often produced by the golfer himself or herself. In fact, a golf swing is so unique to each individual golfer, it can be argued that no two golfers have identical golf swings. 
     In order to address the often diverging needs of the different swings associated with different golfers, golf club designers make different models of golf clubs that have different performance characteristics to help golfers get more performance out of their particular golf swing. More specifically, golf club designers often create different models of golf club heads having different size, shape, and geometry, allowing various golfers to select from the model that suits their game the most. Similarly, golf club shaft designers often create different models of golf club shafts having different weight, flex, and materials to provide the golfer even more variety to truly allow a golfer to select what works best for his or her golf swing. Additionally, some manufacturers have incorporated weight members inside the grip end of the shaft to alter the weight distribution and feel of the golf club to suit the swing of the golfer. 
     SUMMARY 
     The systems, methods, and devices described herein have innovative aspects, no single one of which is indispensable or solely responsible for their desirable attributes. Without limiting the scope of the claims, some of the advantageous features will now be summarized. 
     One aspect of the present technology is the realization that many golfers can benefit from a weight member strategically placed in the grip end of the shaft to optimize their swing. Thus, there exists a need for an adjustable weight member system and method of strategically selecting the position and mass of an optimal weight member to suit each golfer&#39;s swing. The present technology is directed to measuring a golfer&#39;s swing and altering the weight distribution of one or more of their golf clubs to minimize the dispersion distance of their golf shots. More specifically, some embodiments relate to a fitting system designed to recommend a preferred weight distribution for a golfer&#39;s clubs. Some embodiments relate to systems, devices, and methods for altering the weight distribution of a golf club. 
     One non-limiting embodiment of the present technology includes a method of optimizing a weight distribution of a golf club for a golfer&#39;s swing, comprising monitoring one or more dynamic behavioral characteristics of said golfer&#39;s swing, measuring a dispersion distance for at least one golf ball struck towards a target by said golfer using said golfer&#39;s swing, wherein a target line comprises a line extending between said golf ball at address and said target, wherein said dispersion distance is defined as a distance from said target line, measured perpendicularly from said target line to a point at which said golf ball comes to rest after being struck by said golfer using said golfer&#39;s swing, and altering said weight distribution of said golf club to minimize said dispersion distance. 
     An additional non-limiting embodiment of the present technology includes monitoring one or more dynamic behavioral characteristics comprises monitoring a rotation angle of said golfer&#39;s swing through a measurement portion of said golfer&#39;s swing, wherein said target line is parallel to a ground plane, wherein a rotation reference plane is oriented parallel to said target line and perpendicular to said ground plane, and wherein said rotation angle is defined as the relative angle between a grip portion of a golf club being swung by said golfer and said rotation reference plane, said rotation angle measured about an axis perpendicular to said ground plane. 
     An additional non-limiting embodiment of the present technology includes monitoring one or more dynamic behavioral characteristics comprises monitoring a grip-ball offset through a measurement portion of said golfer&#39;s swing, wherein said golf club being swung by said golfer comprises a club reference point, said club reference point defined as a point approximately 5.25 inches from a proximal end of said golf club along a centerline of said golf club, wherein said grip-ball offset is defined as a distance measured along an axis parallel to said target line from said club reference point to the center of said golf ball. 
     An additional non-limiting embodiment of the present technology includes calculating a rotation offset ratio of said golfer&#39;s swing, wherein said rotation offset ratio is defined as the slope of a straight line fit to a plot of rotation angle vs. grip-ball offset over said measurement portion of said golfer&#39;s swing. 
     In an additional non-limiting embodiment of the present technology includes said measurement portion of said golfer&#39;s swing begins at a downswing grip horizontal position and ends at an impact position, wherein said downswing grip horizontal position is defined as the instant during a downswing portion of said golfer&#39;s swing wherein said grip portion of said golf club is parallel to said ground plane, and wherein said impact position is defined as the instant during said golfer&#39;s swing wherein said golf club being swung by said golfer strikes said golf ball. 
     An additional non-limiting embodiment of the present technology includes altering said weight distribution of said golf club comprises comparing said rotation offset ratio of said golfer&#39;s swing to said dispersion distance resulting from said golfer&#39;s swing striking said golf ball and installing a weight member into said golf club. 
     An additional non-limiting embodiment of the present technology includes altering said weight distribution of said golf club further comprises selecting a weight member from a set of interchangeable weight members, said set of interchangeable weight members comprising a proximal weight member and a distal weight member, said proximal weight member distinct and separate from said distal weight member. 
     In an additional non-limiting embodiment of the present technology said proximal weight member comprises a heavy weighted portion, wherein said heavy weighted portion of said proximal weight member is located proximally from said club reference point when installed in said golf club, wherein said distal weight member comprises a heavy weighted portion, wherein said heavy weighted portion of said distal weight member is located distally from said club reference point when installed in said golf club. 
     In an additional non-limiting embodiment of the present technology said golf club comprises a weight receiving grip at a proximal end of a shaft, wherein altering said weight distribution of said golf club comprises expanding a proximal portion of said weight receiving grip with a grip expansion tool and installing a weight member in said weight receiving grip. 
     An additional non-limiting embodiment of the present technology includes a method of optimizing a weight distribution of a golf club for a golfer&#39;s swing, comprising monitoring one or more dynamic behavioral characteristics of said golfer&#39;s swing, altering said weight distribution of said golf club to optimize said golfer&#39;s swing, wherein altering said weight distribution of said golf club comprises evaluating said one or more dynamic behavioral characteristics of said golfer&#39;s swing, selecting a weight member from a set of interchangeable weight members, and installing said weight member into said golf club. 
     In an additional non-limiting embodiment of the present technology said set of interchangeable weight members comprises a proximal weight member and a distal weight member. 
     In an additional non-limiting embodiment of the present technology said golf club comprises a shaft, a grip affixed to a proximal portion of said shaft, and a club head affixed to a distal portion of said shaft, wherein said golf club comprises a club reference point, said club reference point comprising a point approximately 5.25 inches from a proximal end of said golf club along a centerline of said golf club, wherein said proximal weight member comprises a heavy weighted portion, wherein said heavy weighted portion of said proximal weight member is located proximally from said club reference point when installed in said golf club, wherein said distal weight member comprises a heavy weighted portion, wherein said heavy weighted portion of said distal weight member is located distally from said club reference point when installed in said golf club. 
     In an additional non-limiting embodiment of the present technology said heavy weighted portion of said proximal weight member is located immediately adjacent a proximal end of said golf club when installed in said golf club and wherein said heavy weighted portion of said distal weight member is offset distally from said proximal end of said golf club when installed in said golf club. 
     In an additional non-limiting embodiment of the present technology said set of interchangeable weight members further comprises an unweighted cap, wherein said unweighted cap comprises a mass less than approximately 5 grams. 
     In an additional non-limiting embodiment of the present technology said club comprises a weight receiving grip at a proximal end of a shaft, wherein altering said weight distribution of said golf club comprises expanding a proximal portion of said weight receiving grip with a grip expansion tool and installing said weight member in said weight receiving grip. 
     An additional non-limiting embodiment of the present technology includes a system for optimizing weight distribution of a golf club, comprising a weight receiving grip, said weight receiving grip configured to be affixed to a proximal end of a golf club shaft, wherein said weight receiving grip comprises a generally tubular member comprising a shaft bore configured to surround a proximal portion of said shaft, wherein said weight receiving grip comprises a weight retention portion at a proximal end of said weight receiving grip, said weight retention portion configured to engage a weight member, a proximal weight member comprising a grip coupling portion and a heavy weighted portion, said proximal weight member configured to be installed within said weight receiving grip, said grip coupling portion configured to engage said weight retention portion of said weight receiving grip, said heavy weighted portion adjacent a distal end of said grip coupling portion, said heavy weighted portion of said proximal weight member located adjacent said grip coupling portion of said proximal weight member, a distal weight member comprising a grip coupling portion and a heavy weighted portion, said distal weight member configured to be installed within said weight receiving grip, said grip coupling portion configured to engage said weight retention portion of said weight receiving grip, said heavy weighted portion offset distally from said grip coupling portion of said distal weight member, said heavy weighted portion of said distal weight member offset at least 5 inches distally from said grip coupling portion of said distal weight member, and a grip expanding tool configured to deflect a portion of said weight receiving grip facilitating installation or removal of said weight members from said weight receiving grip. 
     In an additional non-limiting embodiment of the present technology said weight retention portion of said weight receiving grip comprises a cavity formed in an internal surface of said weight receiving grip, wherein said weight retention portion of said weight receiving grip comprises a weight retention lip proximal said cavity, said weight retention lip configured to limit said distal weight member and said proximal weight member from dislodging from said weight receiving grip, wherein said grip coupling portion of said proximal weight member and said grip coupling portion of said distal weight member each comprise a grip engaging member, said grip engaging members each configured to reside within said cavity of said weight receiving grip. 
     In an additional non-limiting embodiment of the present technology said weight retention lip comprises a bore comprising an inner diameter, wherein said grip engaging member comprises an outer diameter, wherein said outer diameter of said grip engaging member is larger than said inner diameter of said bore of said weight retention lip, wherein said grip expanding tool is configured to deform said weight retention portion of said grip and expand said inner diameter of said bore of said weight retention lip larger than said outer diameter of said grip engaging member, allowing said grip engaging member to pass through said bore of said weight retention lip. 
     In an additional non-limiting embodiment of the present technology said grip expansion tool comprises a first member, a second member, and a plurality of expansion members, said first member rotatably coupled to said second member, wherein forcing a portion of said first member towards a portion of said second member causes said first member to rotate relative to said second member, wherein said grip expansion tool comprises a weight insertion port, wherein said plurality of expansion members are configured to translate relative to said first member and said second member as said first member rotates relative to said second member, wherein said plurality of expansion members are configured to engage and expand said inner diameter of said bore of said weight retention lip of said weight receiving grip, allowing said grip engaging member to pass through said weight insertion port and said bore of said weight retention lip. 
     In an additional non-limiting embodiment of the present technology said grip expansion tool comprises a first member, a second member, and a plurality of weight members, wherein said first member is rotatably coupled to said second member, wherein said plurality of expansion members are configured to engage said weight retention portion of said grip and define a weight insertion port, and wherein said plurality of expansion members are movably coupled to said first member and said second member such that relative motion of said first member relative to said second member alters the relative position of the plurality of expansion members such that the size of the weight insertion port changes, thereby allowing said grip engaging member to pass through said weight insertion port and into said weight retention portion of said grip. 
     One non-limiting embodiment of the present technology includes a weight member for optimizing weight distribution of a golf club, comprising a removable weight member configured to reside within a shaft of said golf club; said shaft having a proximal end and a distal end, said proximal end opposite a head of said golf club, said distal end adjacent said head of said golf club; said weight member comprising a heavy weighted portion; said heavy weighted portion offset distally from said proximal end of said shaft; said weight member comprising a plurality of locating members; said plurality of locating members configured to limit movement of said heavy weighted portion relative to an inner wall of said shaft. 
     In an additional non-limiting embodiment of the present technology at least one of said plurality of locating members is located at a proximal end of said heavy weighted portion and at least one of said plurality of locating members is located at a distal end of said heavy weighted portion. 
     In an additional non-limiting embodiment of the present technology said weight member comprises a grip coupling portion configured to engage a grip of said golf club, wherein said grip coupling portion comprises a grip engaging member, said grip engaging member configured to reside within a cavity formed in said grip. 
     In an additional non-limiting embodiment of the present technology said weight member further comprises a weight rod, said weight rod configured to affix said heavy weighted portion to said grip coupling portion. 
     In an additional non-limiting embodiment of the present technology said heavy weighted portion is offset distally from said grip coupling portion of said distal weight member at least 5 inches. 
     In an additional non-limiting embodiment of the present technology said weight member further comprises a rod weight coupling member, said rod weight coupling member configured to couple said weight rod to said heavy weighted portion, said rod weight coupling member configured to retain one of said plurality of locating members. 
     In an additional non-limiting embodiment of the present technology said rod weight coupling member comprises a threaded portion configured to engage a threaded portion of said heavy weighted portion. 
     In an additional non-limiting embodiment of the present technology each of said plurality of locating members comprises a central bore, said threaded portion of said weight rod coupling member configured to pass through said central bore of one of said plurality of locating members. 
     In an additional non-limiting embodiment of the present technology each of said plurality of locating members comprises a plurality of engaging arms extending outwards from said heavy weighted portion. 
     In an additional non-limiting embodiment of the present technology each of said plurality of locating members comprises relief slots between each of said engaging arms. 
     In an additional non-limiting embodiment of the present technology said plurality of locating members comprise a three dimensional geometry wherein each of said engaging arms are angled upwards towards said proximal end of said shaft. 
     In an additional non-limiting embodiment of the present technology said plurality of locating members are deformable, allowing said plurality of locating members to adapt to a variety of shafts having different internal diameters as well as shafts with tapered internal diameters. 
     One non-limiting embodiment of the present technology includes a removable weight member configured to reside within a shaft of said golf club; said shaft having a proximal end and a distal end, said proximal end opposite a head of said golf club, said distal end adjacent said head of said golf club; said weight member comprising a heavy weighted portion; said heavy weighted portion offset distally from said proximal end of said shaft; said weight member comprising a locating member; wherein said locating member comprises a plurality of engaging arms extending outwards from said heavy weighted portion; wherein said locating member is deformable, allowing said locating member to adapt to a variety of shafts having different internal diameters as well as shafts with tapered internal diameters; wherein said locating member is configured to limit movement of said heavy weighted portion relative to an inner wall of said shaft. 
     In an additional non-limiting embodiment of the present technology said weight member comprises a grip coupling portion configured to engage a grip of said golf club, wherein said grip coupling portion comprises a grip engaging member, said grip engaging member configured to reside within a cavity formed in said grip. 
     In an additional non-limiting embodiment of the present technology said weight member further comprises a weight rod, said weight rod configured to affix said heavy weighted portion to said grip coupling portion. 
     In an additional non-limiting embodiment of the present technology said heavy weighted portion is offset distally from said grip coupling portion of said distal weight member at least 5 inches. 
     In an additional non-limiting embodiment of the present technology said weight member further comprises a rod weight coupling member, said rod weight coupling member configured to couple said weight rod to said heavy weighted portion, said rod weight coupling member configured to retain said locating member. 
     In an additional non-limiting embodiment of the present technology said rod weight coupling member comprises a threaded portion configured to engage a threaded portion of said heavy weighted portion. 
     In an additional non-limiting embodiment of the present technology said locating member comprises a central bore, said threaded portion of said weight rod coupling member configured to pass through said central bore of said locating member. 
     In an additional non-limiting embodiment of the present technology said plurality of locating members comprises relief slots between each of said engaging arms, wherein locating member comprises a three dimensional geometry wherein each of said engaging arms are angled upwards towards said proximal end of said shaft. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings form a part of the specification and are to be read in conjunction therewith. The illustrated embodiments, however, are merely examples and are not intended to be limiting. Like reference numbers and designations in the various drawings indicate like elements. 
         FIG. 1  illustrates a perspective view of a golf club. 
         FIG. 2  illustrates a top view of a right handed golfer holding a golf club at address adjacent a golf ball. 
         FIG. 3  illustrates a front view of a golf swing at a downswing grip horizontal position. 
         FIG. 4  illustrates a front view of a golf swing at impact. 
         FIG. 5  illustrates a top view of a golf swing at the downswing grip horizontal position. 
         FIG. 6  illustrates a top view of a golf swing at the impact position. 
         FIG. 7  illustrates a top view of the golf swing of  FIG. 5  at downswing grip horizontal, omitting the golfer for simplification. 
         FIG. 8  illustrates a top view of the golf swing of  FIG. 6  at impact, omitting the golfer for simplification. 
         FIG. 9  includes a graph plotting rotation angle vs. grip-ball offset for the golf swing illustrated in  FIGS. 5-8  at a plurality of points between downswing grip horizontal and impact. 
         FIG. 10  illustrates a cross sectional view of a proximal portion of a golf club incorporating a proximal weight member. 
         FIG. 11  illustrates a cross sectional view of a proximal portion of a golf club incorporating a distal weight member. 
         FIG. 12  includes a graph plotting dispersion vs. rotation offset ratio. 
         FIGS. 13A-13E  illustrate processes for determining the optimal golf club weight distribution for a golfer. 
         FIG. 14A  illustrates a cross sectional view of one embodiment of a weight receiving grip. 
         FIG. 14B  illustrates a portion of the weight receiving grip of  FIG. 14A . 
         FIG. 15  illustrates a side view of one embodiment of a proximal weight member. 
         FIG. 16  illustrates a side view of one embodiment of a distal weight member. 
         FIG. 17  illustrates a cross sectional view of the proximal weight member of  FIG. 15  installed in the grip of  FIGS. 14A and 14B . 
         FIG. 18  illustrates a cross sectional view of the distal weight member of  FIG. 16  installed in the grip of  FIGS. 14A and 14B . 
         FIG. 19A-B  illustrate cross sectional views of embodiments of a locating member affixed to a heavy weighted portion of a distal weight member. 
         FIG. 20A-B  illustrate bottom views of embodiments of a locating member. 
         FIG. 21  illustrates a side view of on embodiment of a weight member positioning tool. 
         FIG. 22  illustrates a cross sectional view of the weight member positioning tool of  FIG. 21  engaging a proximal weight member installed in a grip. 
         FIG. 23  illustrates a cross sectional view of one embodiment of an unweighted cap installed in a grip. 
         FIGS. 24 and 25  illustrate perspective views of one embodiment of a grip expansion tool. 
         FIG. 26  illustrates a side view of a cross section of a grip below a weight member and grip expansion tool of  FIGS. 24 and 25 . 
         FIG. 27  illustrates a perspective view of one embodiment of a first member and expansion member of the grip expansion tool of  FIGS. 24 and 25 . 
         FIG. 28  illustrates a perspective view of one embodiment of a second member and expansion member of the grip expansion tool of  FIGS. 24 and 25 . 
         FIGS. 29 and 30  illustrate perspective views of one embodiment of the expansion members of the grip expansion tool of  FIGS. 24 and 25 . 
         FIG. 31  illustrates a top view of the expansion members of  FIGS. 29 and 30 . 
         FIG. 32  illustrates a side view of the expansion members of  FIGS. 29 and 30 . 
         FIGS. 33 and 34  illustrate perspective views of an expansion member of  FIGS. 29 and 30 . 
         FIG. 35  illustrates a cross sectional view of one embodiment of a proximal weight member installed in a golf club utilizing a conventional grip. 
         FIG. 36  illustrates a cross sectional view of one embodiment of a distal weight member installed in a golf club utilizing a conventional grip. 
         FIG. 37  illustrates one embodiment of a sleeve surrounding the shank of a fastener of the grip expanding tool. 
         FIG. 38  illustrates an additional embodiment of a sleeve surrounding the shank of a fastener of the grip expanding tool. 
         FIG. 39  illustrates a perspective view of one embodiment of a distal weight member. 
         FIG. 40  illustrates an exploded view of the distal portion of the distal weight member of  FIG. 39 . 
         FIG. 41  illustrates a perspective view of one embodiment of a locating member. 
         FIG. 42  illustrates a top view of the locating member of  FIG. 41 . 
         FIG. 43  illustrates a perspective view of one embodiment of a weight sleeve with locating members. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, reference is made to the accompanying drawings, which form a part of the present disclosure. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the Figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and form part of this disclosure. For example, a system or device may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such a system or device may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. Alterations and further and further modifications of inventive features illustrated herein, and additional applications of the principles of the inventions as illustrated herein, which would occur to one skilled in the relevant art and having possession of this disclosure, are to be considered within the scope of the invention. 
     Other than in the operating examples, or unless otherwise expressly specified, all of the numerical ranges, amounts, values and percentages such as those for amounts of materials, moments of inertias, center of gravity locations, loft and draft angles, and others in the following portion of the specification may be read as if prefaced by the word “about” even though the term “about” may not expressly appear with the value, amount, or range. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. 
     Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. Furthermore, when numerical ranges of varying scope are set forth herein, it is contemplated that any combination of these values inclusive of the recited values may be used. 
     In describing the present technology, the following terminology may have been used: The singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to an item includes reference to one or more items. The term “plurality” refers to two or more of an item. The term “substantially” means that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide. A plurality of items may be presented in a common list for convenience. However, these lists should be construed as though each member of the list is individually identified as a separate and unique member. Thus, no individual member of such list should be construed as a de facto equivalent of any other member of the same lists solely based on their presentation in a common group without indications to the contrary. Furthermore, where the terms “and” and “or” are used in conjunction with a list of items, they are to be interpreted broadly, in that any one or more of the listed items may be used alone or in combination with other listed items. The term “alternatively” refers to a selection of one of two or more alternatives, and is not intended to limit the selection of only those listed alternative or to only one of the listed alternatives at a time, unless the context clearly indicated otherwise. 
     Features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. After considering this discussion, and particularly after reading the section entitled “Detailed Description” one will understand how the illustrated features serve to explain certain principles of the present disclosure. 
       FIG. 1  illustrates a perspective view of a golf club  100 . The golf club  100  can include a shaft  110 , a grip  200  located at the proximal end  120  of the shaft  110  and a club head  140  located at the distal end  130  of the shaft  110 .  FIG. 2  illustrates a top view of a right handed golfer  10  holding a golf club  100  at address adjacent a golf ball  20 .  FIG. 2  also illustrates a coordinate system centered on the golf ball  20  including an x-axis and a y-axis. The x-axis is oriented down the target line  30 . The target line  30  is defined as a line drawn between the ball  20  and the target at which the golfer  10  is aiming. The y-axis is perpendicular to the x-axis and is oriented towards the golfer  10 . The x-axis and y-axis form a reference plane parallel to the ground plane  80  and offset above the ground plane  80  equal to the distance the center of the golf ball  20  is above the ground plane  80 , as illustrated in  FIG. 3 . The coordinate system also includes a z-axis perpendicular to both the x-axis and y-axis. 
     As illustrated in  FIG. 2 , when a golfer  10  strikes a golf ball  20  with the head  140  of the golf club  100  the initial trajectory of the golf ball  20  can be along the target line  30 , it can be a pull  40  (left of the target line  30  for a right handed golfer  10 ), or it can be a push  50  (right of the target line  30  for a right handed golfer  10 ). Unless noted otherwise, all descriptions of ball flight herein refer to ball  20  struck by a right handed golfer  10 . For a left handed golfer, a pull would be right of the target line  30  and a push would be left of the target line  30 . A ball  20  hit along the target line  30  incorporates an x component in its initial trajectory and an insubstantial y component. The initial trajectory of a pull  40  or push  50  each incorporate both an x component and a y component. The launch angle, and thus the z component of the trajectory, does not affect the classification of the ball flight as along the target line  30 , a pull  40 , or a push  50 . 
     Additionally, as illustrated in  FIG. 2 , the flight of the golf ball  20  can be classified as a draw  60 , where the flight of the ball curves left from the initial trajectory due to side spin, or a fade  70 , where the flight of the ball curves right from the initial trajectory due to side spin. For a left handed golfer, a draw would curve right and a fade would curve left. Again, the launch angle, and thus the z component of the ball path and curve, does not affect the classification of the ball flight as a draw  60  or a fade  70 . 
     Additionally, a ball&#39;s flight can be classified using both the initial trajectory of the ball&#39;s flight as well as the curve of the ball&#39;s flight. For example, a shot which has an initial trajectory left of the target line  30 , and subsequently curves left, can be classified as a pull-draw. A shot which has an initial trajectory right of the target line  30 , and subsequently curves right, can be classified and a push-fade. In some instances, the face angle of the club head  140  as it impacts the ball  20  can affect the flight of the ball. A neutral face, assuming a neutral swing path, will generally create a straight ball flight down the target line  30 . A closed face can cause a pull  40 , a draw  60 , or a pull-draw. An open face can cause a push  50 , a fade  70 , or a push-fade. Additionally, other characteristics of a golfer&#39;s swing can affect the flight of the ball which may include, for example, swing path, swing speed, attack angle, impact location on the face, etc. Generally, a ball flight which deviates either left or right from the target line  30  will land and subsequently roll left or right of the intended target to a final resting location. The distance left or right of the target line  30  at which the ball  20  comes to rest is defined as the dispersion distance. For a right handed golfer  10 , the dispersion distance is positive for a ball  20  coming to rest left of the target line  30  and negative for a ball  20  coming to rest right of the target line  30 . 
     Embodiments described herein generally relate to systems, devices, and methods related to a weight member  300  strategically placed in the grip end of the shaft  110  to optimize their swing. Some embodiments comprise an adjustable weight member system and method of strategically selecting the position and mass of an optimal weight member to suit each golfer&#39;s swing. Some embodiments are directed to a system of measuring a golfer&#39;s swing and altering the weight distribution of one or more of their golf clubs to minimize the dispersion distance of their golf shots. Some embodiments are directed to a system of measuring a golfer&#39;s swing and altering the weight distribution of one or more of their golf clubs to manipulate the flight path of their golf shots. In some embodiments, dispersion distance can refer to the average dispersion distance over a plurality of shots as many golfers cannot hit exactly the same shot repeatedly. More specifically, some embodiments relate to a fitting system designed to recommend a preferred weight distribution for a golfer&#39;s clubs. 
     In some embodiments, a golfer  10  can go through a fitting process which measures various dynamic behavioral characteristics of their swing. More details regarding the composition, operation, and usage of such a fitting system may be found in commonly owned U.S. patent application Ser. No. 13/863,596 to Margoles et al., Fitting System for a Golf Club, filed on Apr. 16, 2013, the disclosure of which is incorporated by reference in its entirety. In addition to the dynamic behavioral characteristics described in the Margoles application, certain dynamic behavioral characteristics of a golfer&#39;s swing can be particularly useful in predicting the effect of altering the weight distribution of a golf club  100  on a golfer&#39;s dispersion distance.  FIG. 3  illustrates a front view of a golf swing at a position which we shall refer to as “downswing grip horizontal.” The downswing grip horizontal position is defined by the instant during the downswing that the grip portion  150  of the golf club  100  is parallel to the reference plane formed by the x-axis and y-axis, and thus parallel to the ground plane  80 .  FIG. 4  illustrates a front view of a golf swing at a position which we shall refer to as “impact.” The impact position is defined by the instant during the swing that the club head  140  of the golf club  100  strikes the golf ball  20 . The grip portion  150  of the golf club  100  refers to the most proximal portion of the golf club  100  and is approximately 12 inches long. 
     In some embodiments, dynamic behavioral characteristics of a golf swing can be measured during the portion of the swing between the downswing grip horizontal position and the impact position. In other embodiments, the endpoints of the measurement may differ from those described above. For example, in one embodiment the measurement could begin at a different portion of the swing where the grip portion  150  of the golf club  100  is angled relative to the reference plane. In another embodiment the measurement could end at a different portion of the swing other than the instant that the golf club head  140  strikes the golf ball  20 . 
       FIG. 5  illustrates a top view of a golf swing at the downswing grip horizontal position.  FIG. 6  illustrates a top view of a golf swing at the impact position.  FIGS. 5 and 6  include a rotation reference plane  90  which is parallel to a plane formed by the x-axis and z-axis. As the golfer  10  progresses through their swing from downswing grip horizontal to impact, the fitting system can monitor the relative angle between the grip portion  150  of the golf club  100  and the rotation reference plane  90  about an axis parallel to the z-axis, which is referred to herein as the rotation angle α. The rotation angle α is measured from the rotation reference plane  90  in a counterclockwise direction. The rotation angle α of the swing at downswing grip horizontal illustrated in  FIG. 5  is approximately 0 degrees where the grip portion  150  of the golf club  100  is substantially parallel to the rotation reference plane  90 . A different swing, not illustrated, may incorporate a non-zero rotation angle α at the downswing grip horizontal portion of a golfer&#39;s swing. In some swings, the grip portion  150  of the golf club  100  can be angled clockwise relative to the rotation reference plane  90  at downswing grip horizontal resulting in a negative rotation angle α. In some swings, the grip portion  150  of the golf club  100  can be angled counterclockwise relative to the rotation reference plane  90  at downswing grip horizontal resulting in a positive rotation angle α. In  FIG. 6 , the rotation angle α of the swing at impact is approximately 90 degrees. A different swing may incorporate a rotation angle α above or below 90 degrees at impact. A golfer who leads more with their hands, for example, may have a rotation angle α below 90 degrees at impact. 
       FIG. 7  illustrates a top view of the golf swing of  FIG. 5  at downswing grip horizontal, omitting the golfer  10  for simplification.  FIG. 8  illustrates a top view of the golf swing of  FIG. 6  at impact, omitting the golfer  10  for simplification. The grip of the golf club  100  illustrated in  FIGS. 7 and 8  includes a club reference point  205 , which is defined as a point 5.25 inches from the proximal end  120  of the golf club  100  along the golf club&#39;s centerline.  FIGS. 7 and 8  each also illustrate the grip-ball offset Dx, which is defined as the distance along the x-axis the club reference point  205  is offset from the center of the golf ball  20 . Any measurement of the grip-ball offset Dx wherein the grip is behind the golf ball  20  results in a negative grip-ball offset Dx and any measurement of the grip-ball offset Dx wherein the grip is in front of the golf ball  20  results in a positive grip-ball offset Dx. As the golfer  10  progresses through their swing from downswing grip horizontal to impact, the fitting system can monitor the grip-ball offset Dx. The grip ball  20  offset illustrated in  FIG. 7  is approximately −0.31 meters. A different swing may incorporate a different grip-ball offset Dx at downswing grip horizontal, which for example, may be more or less than −0.31 meters. The grip ball  20  offset illustrated in  FIG. 8  is approximately −0.01 meters. A different swing may incorporate a different grip-ball offset Dx at impact, which for example, may be more or less than −0.01 meters. 
     In some embodiments, the fitting system can utilize a single dynamic behavioral characteristic of a golf swing to aid in the recommendation for altering the weight distribution of one or more of a golfer&#39;s clubs. In some embodiments, the fitting system can utilize a combination of dynamic behavioral characteristics of a golf swing to aid in the recommendation for altering the weight distribution of one or more of a golfer&#39;s clubs. In some embodiments, the dynamic behavioral characteristics can include for example, the relationship between rotation angle α and grip-ball offset Dx for a golfer&#39;s swing.  FIG. 9  includes a graph plotting rotation angle α vs. grip-ball offset Dx for the golf swing illustrated in  FIGS. 5-8  at a plurality of points between downswing grip horizontal and impact. Fitting a straight line to the plurality of points and calculating the slope of that line yields an additional dynamic behavioral characteristic, the rotation offset ratio, a ratio which can be helpful in the recommendation for altering the weight distribution of one or more of a golfer&#39;s clubs. The rotation offset ratio of the golf swing illustrated in  FIGS. 5-9  is approximately 300 Degrees/Meter. 
       FIG. 10  illustrates a cross sectional view of a proximal portion of a golf club  100  incorporating a proximal weight member  300 A. In some embodiments, as illustrated in  FIG. 10 , the golf club  100  can include a proximal weight member  300 A located immediately adjacent the proximal end  120  of the golf club  100 . The proximal weight member  300 A can alter the weight distribution of the golf club  100 .  FIG. 11  illustrates a cross sectional view of a proximal portion of a golf club  100  incorporating a distal weight member  300 B. In some embodiments, as illustrated in  FIG. 11 , the golf club  100  can include a distal weight member  300 B offset distally from the proximal end  120  of the golf club  100 . In some embodiments, as illustrated in  FIG. 11 , the distal weight member  300 B can be offset from the proximal end  120  of the golf club  100  such that the distal weight member  300 B is located distally of the club reference point  205 . 
       FIG. 12  includes a graph plotting dispersion distance vs. rotation offset ratio. The graph illustrates the expected change in dispersion distance for golfers having particular rotation offset ratios utilizing a variety of distal and proximal weight members relative to a golf club utilizing an unweighted cap  300 C, as illustrated in  FIG. 23 , which emulates a standard golf club not utilizing improved weight distribution as described herein. The relationships illustrated in  FIG. 12  were developed through extensive testing of over  100  golfers of varying ability, technique, swing speed, etc., utilizing the fitting system described in the Margoles application. Testing showed a statistically significant trend that for a right handed golfer, a proximal weight member  300 A tends to alter ball flight such that the ball  20  comes to rest to the right of a shot hit by an otherwise identical golf club  100  not incorporating a proximal weight member  300 A or distal weight member  300 B, and that a distal weight member  300 B tends to alter ball flight such that the ball  20  comes to rest to the left of a shot hit by an otherwise identical golf club  100  not incorporating a proximal weight member  300 A or distal weight member  300 B. Testing also showed that by increasing the mass of the proximal weight member  300 A or distal weight member  300 B, the effect of the proximal weight member  300 A or distal weight member  300 B is amplified. Finally, testing showed that the effect of the proximal weight member  300 A and distal weight member  300 B is more profound for golfers with a higher rotation offset ratio than those with a lower rotation offset ratio. While  FIG. 12  is directed to drivers, the trends also apply to other clubs including for example, fairways, hybrids, irons, and wedges. 
     Testing has showed that a proximal weight member  300 A tends to result in a slightly open clubface at impact relative to an otherwise identical golf club  100  not incorporating a proximal weight member  300 A or distal weight member  300 B. Testing has also showed that a distal weight member  300 B tends to result in a slightly closed clubface at impact relative to an otherwise identical golf club  100  not incorporating a proximal weight member  300 A or distal weight member  300 B. The effect of the proximal weight member  300 A and distal weight member  300 B on the face angle of the club at impact are understood to be at least partially responsible for the change in dispersion distance for golf shots relative to shots hit with a standard golf club  100  not utilizing improved weight distribution. As discussed earlier, a closed clubface at impact can cause a pull  40 , a draw  60 , or a pull-draw and an open clubface at impact can cause a push  50 , a fade  70 , or a push-fade. It is important to note that proximal weight member  300 A and distal weight member  300 B can affect other aspects of the swing other than just face angle at impact, some of which may also have an impact on dispersion distance. 
     In some embodiments, a golfer  10  can go through a fitting process to determine the optimal golf club weight distribution for their swing to minimize their dispersion distance.  FIGS. 13A-13E  illustrate processes for determining the optimal golf club weight distribution for a golfer  10 . As illustrated in  FIG. 13A , in some embodiments, the fitting process can include a step  405  comprising monitoring one or more dynamic behavioral characteristics of the golfer&#39;s swing. In some embodiments, the characteristics can be monitored, measured or calculated utilizing the fitting system described in the Margoles application. An additional step  410  can include the weight distribution of the golf club  100  being altered to minimize the dispersion distance for shots hit by the golfer  10 . In some embodiments, the dynamic behavioral characteristics can include rotation angle α. In some embodiments, the dynamic behavioral characteristics can include grip-ball offset Dx. In some embodiments, as illustrated in a step  415  of  FIG. 13B , the dynamic behavioral characteristics can include the rotation offset ratio of the golfer&#39;s swing. In some embodiments, as illustrated in  FIG. 13C , the fitting process can include a step  420  comprising measuring the dispersion distance for at least one shot hit by the golfer  10 . The dispersion distance measured can be utilized to determine the amount of ball flight correction necessary and thus the appropriate weight distribution of the golf club  100  to minimize the dispersion distance for shots hit by the golfer  10 . In some embodiments, as illustrated in  FIG. 13D , the fitting process can include a step  425  comprising selecting the appropriate weight member from a set of interchangeable weight members to alter the weight distribution of the golf club  100  to minimize the dispersion distance for shots hit by the golfer  10 . 
     In some embodiments, as illustrated in  FIG. 13E , the fitting process can include a step  430  comprising determining whether a weight member would aid in minimizing the dispersion distance for shots hit by the golfer  10 . An additional step  435  can include not altering the weight distribution of the club if the golfer  10  is already hitting their shots along the target line  30 . If the golfer  10  is hitting their shots either left or right of the target line  30 , an additional step  440  can comprise selecting either a proximal weight member  300 A or a distal weight member  300 B to correct the ball flight. An additional step  445  can comprise selecting the mass of the weight member to suit the amount of correction desired and minimize the dispersion distance for shots hit by the golfer  10 . 
     As described above, the right handed golfer  10  illustrated in  FIGS. 5-8  has a rotation offset ratio of approximately 300 Degrees/Meter. Let&#39;s assume for example, that the golfer  10  illustrated in  FIGS. 5-8  consistently hits the ball  20  left of the target line  30 , averaging approximately 8 yards dispersion distance and would like to minimize their dispersion distance. Based on the testing and trends described above and represented in  FIG. 12 , the fitting system would recommend a proximal weight member  300 A to alter the weight distribution of the golf club  100  causing the ball flight to be corrected to the right towards the target line  30  and minimizing the dispersion distance for shots by the golfer  10  utilizing the golf club  100  with the proximal weight member  300 A. Since the golfer  10  was averaging approximately 8 yards dispersion distance to the left of the target line  30  and has a 300 Degree/Meter rotation offset ratio, as illustrated in  FIG. 12 , the fitting system can recommend a 60 gram proximal weight member  300 A to offer the correct amount of ball flight correction to bring the ball&#39;s flight back towards the target line  30 . If the golfer  10  had a higher rotation offset ratio, a smaller proximal weight member  300 A may be appropriate. If the golfer  10  had a lower rotation offset ratio, a larger proximal weight member  300 A may be appropriate. If, on the other hand, the golfer  10  had been consistently hitting the ball  20  right of the target line  30 , the fitting system may have recommended a distal weight member  300 B. In some embodiments, the fitting process can further comprise evaluating ball flight and dispersion distance once the golfer&#39;s club has been fitted with the recommended weight member. In some embodiments, at least a portion of the process can be repeated to further fine tune the weight distribution of the golf club  100 . In some embodiments, the adjustable weight member system can include a single proximal weight member and a single distal weight member, and the fitting system can recommend either the proximal weight member or the distal weight member, depending on whether the golfer is hitting left or right of the target line. 
       FIG. 14A  illustrates a cross sectional view of one embodiment of a weight receiving grip  200  and  FIG. 14B  illustrates a portion of the weight receiving grip  200 . In some embodiments, the adjustable weight member system can include a weight receiving grip  200 . The grip  200  can comprise a generally tubular member having a shaft bore  208  and be configured to surround the proximal portion of the shaft  110 . The grip can include a weight retention portion  210  at a proximal end  120  of the grip. The weight retention portion  210  can be configured to receive a weight member. In some embodiments, the weight retention portion  210  is configured to receive a proximal weight member  300 A. In some embodiments, the weight retention portion  210  is configured to receive a distal weight member  300 B. In some embodiments, as illustrated in  FIGS. 14A and 14B , the weight retention portion  210  is capable of receiving either a proximal weight member  300 A or a distal weight member  300 B. As illustrated in  FIG. 14B , the weight retention portion  210  includes a cavity  215  configured to receive and retain a portion of a weight member  300 A,  300 B,  300 C. The cavity  215  is formed in the internal surface  220  of the grip. The cavity  215  comprises a larger diameter than the internal surface  220  of the grip. In some embodiments, the weight retention portion  210  can include a bore  225  configured to receive a weight member  300 A,  300 B,  300 C as the weight member  300 A,  300 B,  300 C is being installed or removed from the golf club  100 . 
       FIG. 15  illustrates one embodiment of a proximal weight member  300 A. In some embodiments, the proximal weight member  300 A can include a grip coupling portion  305 A. The grip coupling portion  305 A can be configured to engage the grip  200 . In some embodiments, the grip coupling portion  305 A can be configured to engage the weight retention portion  210  of the grip  200 . In some embodiments, the grip coupling portion  305 A can be configured to engage the cavity  215  of the grip  200 . In some embodiments, the grip coupling portion  305 A can include a grip engaging member  310 A configured to engage the cavity  215  of the grip  200 . In some embodiments, the proximal weight member  300 A can be substantially circular in shape and the grip engaging member  310 A can comprise a diameter larger than the rest of the proximal weight member  300 A. In some embodiments, the diameter of the grip engaging member  310 A can be substantially the same as the diameter of the cavity  215  of the grip  200 . In some embodiments, the diameter of the grip engaging member  310 A can be slightly larger or smaller than the diameter of the cavity  215  of the grip  200 . The thickness of the grip engaging member  310 A can also be substantially the same as the height of the cavity  215  of the grip  200  such that the grip engaging member  310 A can reside within the cavity  215  of the grip  200  and retain the proximal weight member  300 A in the grip  200 . 
     In some embodiments, the proximal weight member  300 A can also include a heavy weighted portion  315 A. The heavy weighted portion  315 A can be located distally of the grip engaging member  310 A. The heavy weighted portion  315 A can be adjacent the grip coupling portion  305 A. In some embodiments, the heavy weighted portion  315 A can be formed integrally with the grip coupling portion  305 A. As illustrated in  FIG. 17 , the heavy weighted portion  315 A can be formed separately from the grip coupling portion  305 A and affixed to the grip coupling portion  305 A. In some embodiments, the heavy weighted portion  315 A can range anywhere from approximately 5 grams to 150 grams. In some embodiments, a plurality of weight members can be provided which may include a few mass options for the proximal weight member  300 A, which may include for example, 15 grams, 30 grams, 45 grams, and 60 grams. In some embodiments, the golf club  100  can utilize a low weight shaft  110  to offset the addition of a proximal weight member  300 A or distal weight member  300 B. In some embodiments, the low weight shaft  110  can comprise a mass between approximately 45 grams and 60 grams and more preferably between approximately 50 and 55 grams. In some embodiments, the golf club  100  can utilize a low weight grip  200  to offset the addition of a proximal weight member  300 A or distal weight member  300 B. In some embodiments, the low weight grip  200  can comprise a mass between approximately 20 grams and 50 grams, more preferably between approximately 25 and 40 grams, and more preferably between approximately 30 and 35 grams. 
       FIG. 16  illustrates one embodiment of a distal weight member  300 B. In some embodiments, the distal weight member  300 B can include a grip coupling portion  305 B as described above in reference to the proximal weight member  300 A. In addition, the distal weight member  300 B can include a heavy weighted portion  315 B as described above in reference to the proximal weight member  300 A. The heavy weighted portion  315 B of the distal weight member  300 B, as illustrated in  FIG. 16 , is offset distally from the grip coupling portion  305 B, and thus the proximal end  120  of the grip. In some embodiments, the heavy weighted portion  315 B can be affixed to the grip coupling portion  305 B via a weight rod  320 . In some embodiments, the grip coupling portion  305 B, weight rod  320 , and heavy weighted portion  315 B can be formed integrally. In some embodiments, the grip coupling portion  305 B, weight rod  320 , and heavy weighted portion  315 B can be formed separately and affixed to one another. In some embodiments, the grip coupling portion  305 B and weight rod  320  can be formed integrally and affixed to the heavy weighted portion  315 B. The components of the proximal weight member  300 A or distal weight member  300 B can be affixed to one another using a variety of techniques, which may include for example, bonding, threading, interference fitting, welding, brazing, adhesives, etc. 
       FIG. 17  illustrates a cross sectional view of the proximal weight member  300 A of  FIG. 15  installed in the grip  200  of  FIGS. 14A  and B. As illustrated in  FIG. 17 , the grip engaging member  310 A of the proximal weight member  300 A engages the cavity  215  of the grip  200 , retaining the proximal weight member  300 A within the grip  200  and within the golf club  100 . In some embodiments, the diameter of the bore  225  of the grip  200  can be smaller than the diameter of the cavity  215  such that a proximal portion of the grip  200  forms a weight retention lip  230  configured to retain the proximal weight member  300 A in the weight retention portion  210  of the grip  200 . The weight retention lip  230  can abut the proximal surface of the grip engaging member  310 A of the proximal weight member  300 A, limiting the proximal weight member  300 A from becoming dislodged from the cavity  215 , and thus limiting the proximal weight member  300 A from sliding out of the golf club  100 . 
       FIG. 18  illustrates a cross sectional view of the distal weight member  300 B of  FIG. 16  installed in the grip  200  of  FIGS. 14A  and B. In some embodiments, the grip engaging member  310 B of the distal weight member  300 B engages the cavity  215  of the grip  200 , as described above in reference to the proximal weight member  300 A. The heavy weighted portion  315 B offset distally from the grip coupling portion  305 B as illustrated in  FIG. 18 , can be located within the shaft bore  208  and inside the shaft  110 . 
     One concern regarding weight members, particularly distal weight members  300 B, is that the heavy weighted portion  315 B may move within the shaft  110  and impact the inner wall  160  of the shaft  110 , creating a rattle during use of the golf club  100 . In some embodiments, the heavy weighted portion  315 B of the distal weight member  300 B can include a locating member  325  configured to limit movement of the heavy weighted portion  315 B relative to the inner wall  160  of the shaft  110 . 
       FIG. 19A-B  illustrate cross sectional views of embodiments of a locating member  325  affixed to a heavy weighted portion  315 B of a distal weight member  300 B.  FIG. 20A-B  illustrate bottom views of embodiments of a locating member  325 . In some embodiments, as illustrated in  FIGS. 20A, and 20B , the locating member  325  can be substantially circular in shape. The locating member  325  can be affixed to the heavy weighted portion  315 B. The locating member  325  can contact the inner wall  160  of the shaft  110 , limiting movement of the heavy weighted portion  315 B relative to the shaft  110 . The locating member  325  can be configured to deflect upon insertion in the shaft  110 , allowing the locating member  325  and distal weight member  300 B to be installed in a variety of shafts  110 , each having a different inner diameter. In some embodiments, the heavy weighted portion  315 B can include a round  317  on its distal outer edge, allowing the locating member  325  to deflect and minimizing localized stresses in the locating member  325  as it deflects. In other embodiments, the heavy weighted portion  315 B can include a chamfer. In some embodiments, as illustrated in  FIG. 19 , the locating member  325  is affixed to a distal portion of the heavy weighted portion  315 B. The locating member  325  includes a central bore  330  configured to receive a fastener  335 . In some embodiments, as illustrated in  FIG. 19A  the fastener  335  comprises a threaded portion configured to engage a threaded bore  316  in the heavy weighted portion  315 B. In some embodiments, not illustrated, the fastener  335  can comprise a push in retainer clip, sometimes referred to as a Christmas tree clip. The push in retainer clip can comprise a ribbed shank which prevents the fastener  335  from backing out of the heavy weighted portion  315 B once the fastener  335  has been inserted into the bore  316 . In some embodiments, the bore  316  can be threaded. In other embodiments, the bore  316  can comprise ridges, ribs, roughened surfaces, etc. 
     In some embodiments, as illustrated in  FIG. 19B , the heavy weighted portion  315 B can include a locating member retention portion  336 . The locating member retention portion  336  includes a protrusion extending distally from the heavy weighted portion  315 B. The locating member retention portion  336  includes a groove configured to receive the locating member  325  and an enlarged portion adjacent and distal of the groove. The central bore  330  of the locating member  325  can be configured to expand as it slides over the enlarged distal portion before settling into the groove. The enlarged distal portion can then retain the locating member  325  in the groove. In an additional embodiment, not illustrated, the locating member  325  could be located on a proximal side of the heavy weighted portion  315 B. The locating member  325  can be at least partially retained by the weight rod  320 . 
     As illustrated in  FIGS. 20A and 20B , the locating member  325  comprises a plurality of engaging arms  340  separated by a plurality of relief slots  345 , allowing the locating member  325  to deflect upon installation within the shaft  110 . The locating member  325  can be configured to cushion the heavy weighted portion  315 B from the inner wall  160  of the shaft  110  as the golf club  100  impacts the ball  20 . In some embodiments, as illustrated in  FIG. 20A , the relief slots  345  can be substantially rectangular and the engaging arms  340  can be trapezoidal in shape. In some embodiments, as illustrated in  FIG. 20B , the relief slots  345  can be trapezoidal in shape and the engaging arms  340  can be rectangular. In some embodiments, the relief slots  345  can be triangular in shape. In some embodiments, the locating member  325  can comprise one or more materials which may include, for example, plastic, thermoplastic, elastomer, polycarbonate, acetal resin, polyethylene, polypropylene, polystyrene, neoprene, rubber, etc. In other embodiments (not illustrated), the locating member  325  can comprise a compressible yet resilient material which surrounds at least a portion of the heavy weighted portion  315 B. In some embodiments, the locating member  325  can comprise a foam material, preferable a closed cell foam material. In some embodiments, not illustrated, the locating member  325  can be affixed to the outer surface of the heavy weighted portion  315 B. In some embodiments, the proximal weight member  300 A can also utilize a locating member  325  as described above in reference to the distal weight member  300 B. 
       FIG. 21  illustrates a side view of on embodiment of a weight member positioning tool  500 .  FIG. 22  illustrates a cross sectional view of the weight member positioning tool  500  of  FIG. 21  engaging a proximal weight member  300 A installed in a grip  200 . In some embodiments, the adjustable weight member system can include a weight member positioning tool  500 . The weight member positioning tool  500  is configured to engage the proximal weight member  300 A and distal weight member  300 B, aiding in their installation and removal from a golf club  100 . In some embodiments, as illustrated in  FIG. 22 , the distal portion  510  of the weight member positioning tool  500  is threaded and configured to threadably engage an internally threaded tool engaging portion  350  formed in a proximal portion of the weight member  300 A,  300 B. Once the weight member positioning tool  500  has engaged the weight member  300 A,  300 B, the golfer  10  can grip the proximal portion  520  of the weight member positioning tool  500  with their hand and install or remove the weight member  300 A,  300 B from the golf club  100 . 
       FIG. 23  illustrates a cross sectional view of one embodiment of an unweighted cap  300 C installed in a grip  200 . In some embodiments, a golfer  10  may prefer a standard weight distribution in a golf club  100  and does not require a proximal weight member  300 A or a distal weight member  300 B. An unweighted cap  300 C, such as the one illustrated in  FIG. 23 , which is similar in construction to the grip coupling portion  305 A,  305 B of the proximal weight member  300 A and distal weight member  300 B, however it does not include a heavy weighted portion  315 A,  315 B. The unweighted cap  300 C can provide a consistent appearance along with the proximal weight member  300 A and distal weight member  300 B, without significantly changing the weight distribution of the golf club  100 . 
     As discussed above and illustrated in  FIG. 17 , the grip can include a weight retention lip  230  to retain the grip coupling portion  305 A,  305 B of the weight member in the weight retention portion  210  of the grip  200 . Inherently, the weight retention lip  230  can inhibit ease of installation and removal of the weight member  305 A,  305 B into the golf club  100 .  FIGS. 24 and 25  illustrate perspective views of one embodiment of a grip expansion tool  600 . In some embodiments, the adjustable weight member system can include a grip expansion tool  600  configured to aid in the installation and removal of the weight member  305 A,  305 B. 
     As illustrated in  FIGS. 24-28 , the grip expansion tool  600  can be configured to expand a portion of the grip  200  to allow for installation or removal of a weight member  305 A,  305 B. A portion of the tool can be configured to enter the bore  225  of the grip  200  and expand the weight retention lip  230 , allowing for installation or removal of the weight member  305 A,  305 B. The grip expansion tool  600  can include a first grip  612  and a second grip  622  configured to be engaged by the hand of the golfer  10 . The grip expansion tool  600  can also include a plurality of expansion members  640  configured to engage the bore  225  of the grip. As the golfer  10  forces the first grip  612  towards the second grip  622 , the expansion members engage the bore of the grip, deforming the weight retention lip  230  of the grip  200 , and increasing the diameter of the inner surface of the bore  225  of the grip  200 , allowing for the weight member to be installed or removed from the golf club  100 . 
     As illustrated in  FIGS. 27-28 , the grip expansion tool  600  can include a first member  610  and a second member  620 . The first member  610  can be rotatably coupled to the second member  620 , as illustrated in  FIGS. 24-26 . The first member  610  can comprise a first grip  612  and the second member  620  can comprise a second grip  622 . The grip expansion tool  600  can be configured such forcing the first grip  612  towards the second grip  622  causes the first member  610  to rotate relative to the second member  620 , forcing a plurality of expansion members  640  outward, increasing the diameter of the inner surface of the bore  225  of the grip  200 , allowing for the weight member to be installed or removed from the golf club  100 . In some embodiments, the grip expansion tool  600  includes a spring  605  configured to force the first grip  612  away from the second grip  622 . The grip expansion tool  600  includes a weight insertion port  630 , configured such that the weight member  300 A,  300 B can slide through the weight insertion port  630  while installing or removing the weight member  300 A,  300 B from the golf club  100 . 
     When assembled, the expansion tool has a first outer surface  614  on the first member  610  and a second outer surface  624  on the second member  620 . The grip expansion tool  600  can be placed adjacent the proximal end of the grip  200  during use, with the second outer surface  624  of the second member  620  closer to the golf club  100  and the first outer surface  614  of the first member  610  further away from the golf club. The first member  610  includes an inner surface  615 , opposite the first outer surface  614 . The second member  620  includes an inner surface  625 , opposite the second outer surface  624 . 
     In some embodiments, the grip expansion tool  600  can include a plurality of expansion members  640 . In some embodiments, as illustrated in  FIGS. 24-32 , the grip expansion tool  600  includes four expansion members  640 . In other embodiments, the grip expansion tool  600  can include for example, 2, 3, 5, 6, or more expansion members  640 . In some embodiments as illustrated in  FIGS. 24-34 , each of the expansion members  640  are configured to translate as the first member  610  is rotated relative to the second member  620 . Each expansion member  640  is configured to translate along a different path such that a line extending along each of the paths would intersect an axis passing through the center of the weight insertion port  630 . Each of the paths are substantially perpendicular to an axis passing through the center of the weight insertion port  630 . Each expansion member  640  includes a grip expanding protrusion  642  configured to engage the inner surface of the bore  225  of the grip  200 . The grip expanding protrusions  642  of the plurality of expansion members  640  form a segmented and substantially circular surface configured to engage the inner surface of the bore  225  of the grip  200 . As the first grip  612  is forced towards the second grip  622  and the first member  610  is rotated relative to the second member  620 , the plurality of expansion members  640  are forced outward away from the center of the weight insertion port  630 , effectively increasing the diameter of the substantially circular surface formed by the grip expanding protrusions  642  of the expansion members  640 . In some embodiments, the second member  620  can be configured to remain stationary relative to the gold club  100  during use and the first member can be configured to rotate relative to the second member  620  as well as the golf club  100 . In other embodiments (not illustrated), the plurality of expansion members  640  can be configured to be forced towards the center of the weight insertion port  630  as the grips are forced together, and as the grips are released, the force of the spring  605  forces the plurality of expansion members  640  outward away from the center of the weight insertion port  630 . 
     As illustrated in  FIG. 26 , the grip expanding protrusions  642  are configured to be inserted into the bore  225  of the grip  200 . As illustrated in  FIGS. 29 and 32 , the grip expanding protrusions  642  include a shelf  648  configured to limit the distance the grip expanding protrusions  642  can extend into the bore  225  of the grip  200 . The shelf  648  is configured to abut the weight retention lip  230  of the grip  200  as the grip expanding protrusions  642  are inserted into the bore  225  of the grip  200 . In some embodiments, the shelf  648  can be located on the expanding protrusions  642  such that the expanding protrusion does not extend further into the bore  225  of the grip  200  than the thickness of the weight retention lip  230 . As the first grip  612  and second grip  622  of the grip expansion tool  600  are squeezed together, the plurality of expansion members  640  are forced outward, the grip expanding protrusions  642  contacting the inner diameter of the bore  225 , deforming the weight retention lip  230  of the grip  200 , and increasing the diameter of the inner surface of the bore  225  of the grip  200 , allowing for the weight member to be installed or removed through the weight insertion port  630 , through the bore  225  of the grip, and into the golf club  100 . 
     As illustrated in  FIGS. 27-31 , the plurality of expansion members  640  can include a variety of locating features causing the expansion members  640  to translate as the first member  610  is rotated relative to the second member  620 . A portion of each of the plurality of expansion members  640  is configured to reside between the inner surface  615  of the first member  610  and the inner surface  625  of the second member  620 . As illustrated in  FIG. 27 , the inner surface  615  of the first member  610  includes a plurality of slide posts  617 . As illustrated in  FIGS. 29-31 , the plurality of expansion members  640  can each include a slide slot  644  configured to slideably receive a slide post  617 . As illustrated in  FIG. 28 , the inner surface  625  of the second member  620  includes a plurality of guide rails  627 . As illustrated in  FIGS. 29-31 , the plurality of expansion members  640  each includes a guide channel  645  configured to slideably receive a guide rail  627 . In some embodiments, the slide slots  644  are through slots passing all the way through the expansion member  640  and the guide channels  645  are blind and do not pass all the way through the expansion member. The plurality of expansion members  640  can be installed in the grip expansion tool  600  such that the slide slots  644  slideably engage the slide posts  617  and the guide channels  645  slideably engage the guide rails  627 . 
     In some embodiments, the guide rails  627  and guide channels  645  are aligned such that they only allow translation towards or away the center of the weight insertion port  630 . The guide rails  627  and guide channels  645  are configured such that the expansion members  640  rotate with the second member  620  as the first member  610  is rotated relative to the second member  620 . The slide slots  644  and slide posts  617  are configured such that as the first member  610  is rotated relative to the second member  620  and the expansion members  640  rotate relative to the first member  610 , the expansion members  640  translate along the guide rails  627  either towards or away from the center of the weight insertion port  630 . In some embodiments, as illustrated in  FIGS. 24-34  the expansion members  640  are configured to slide away from the center of the weight insertion port  630  as the first grip  612  is squeezed towards the second grip  622 . In some embodiments, the guide channel  645  and guide rail  627  effectively limits the translation travel of the expansion members  640  to provide the required range of translation travel. In other embodiments (not illustrated), the angle of the slide slot  644  could be reversed and the expansion members  640  can be configured to slide towards the center of the weight insertion port  630  as the first grip  612  is squeezed towards the second grip  622 . 
     In some embodiments, as illustrated in  FIG. 28 , the grip expansion tool  600  includes a plurality of spacers  626 . The spacers  626  are configured to space the inner surface  615  of the first member  610  from the inner surface  625  of the second member  620 , providing clearance between the first member  610  and second member  620  so that the expansion members  640  are able to move relative to both the first member  610  and second member  620 . In some embodiments the spacers  626  is affixed to the second member  620 . In some embodiments, as illustrated in  FIG. 28 , the spacers  626  are formed integrally with the second member  620 . In other embodiments, the spacers  626  can be affixed or integrally formed with the first member  610  or the spacers  626  can comprise individual parts held between the first member  610  and second member  620  with fasteners  608 . In some embodiments, the first member  610  is rotatably coupled to the second member  620  via a plurality of fasteners  608  and coupling slots  616 . The second member  620  can comprise fastener bores  629  and the fasteners can be configured to engage the fastener bores  629  of the second member  620 . In some embodiments, the first member  610  includes a plurality of coupling slots  616 , each configured to slideably receive a portion of a fastener  608 . In some embodiments, the width of the coupling slot  616  is configured to complement the shank diameter of the fastener  608  but not allow the head  140  of the fastener  608  to pass through the coupling slot  616 , thus fastening the first member  610  to the second member  620 , yet allowing the fasteners to slide within the coupling slots  616 , and thus allowing the first member  610  to rotate relative to the second member  620 . In some embodiments, the spacers  626  can replace the function of the guide rails  627  by slideably interacting with the plurality of expansion members  640 . In some embodiments, the spacers  626  can further guide the expansion members  640  in conjunction with the guide rails  627 . In some embodiments, the spacers  626  include an abutment surface  628 , limiting the travel of the expansion members  640  as illustrated in  FIG. 28 . 
     In additional embodiments, as illustrated in  FIG. 37 , the grip expansion tool  600  can include a plurality of sleeves  609  configured to surround a portion of the shank of each fastener  608 . The sleeves can include an inner diameter substantially similar to the diameter of the shank of the fastener  608  and an outer diameter substantially similar to the width of the coupling slot  616  formed in the first member  610 . The height of the sleeve  609  is configured to prevent the head of the fastener  608  from bottoming out against the first member  610  and binding rotation of the first member relative to the second member. In some embodiments, the sleeve  609  is slightly taller than the thickness of the first member  610 , allowing the fastener  608  to be tightened down without binding the grip expansion tool  600 . In some embodiments, the sleeve  609  is configured to abut the spacer  626 . In some embodiments, not illustrated, the sleeve  609  can be formed integrally with the fastener, similar to a shoulder bolt. In some embodiments, as illustrated in  FIG. 38 , the spacer  626  can comprise a second sleeve, the spacer  626  formed separately from the first member  610  or second member  620 . The spacer  626  can include an inner diameter substantially similar to the shank diameter of the fastener and an outer diameter larger than the width of the coupling slot  616 . The spacer  626  can be configured to keep the first member  610  the appropriate distance away from the second member  612 , allowing the expansion members  640  to move relative to the first member  610  and second member  612 . 
     As described herein some features of the grip expansion tool  600  may be described in reference to a first member  610  or second member  620 , however in additional embodiments, those features may be applied to the opposite member and in various combinations and arrangements not specifically illustrated in the Figures. 
     In some embodiments, the proximal weight member  300 A and distal weight member  300 B can be installed in a more permanent fashion than otherwise described herein.  FIG. 35  illustrates a cross sectional view of one embodiment of a proximal weight member  300 D installed in a golf club  100  utilizing a conventional grip  200 B.  FIG. 36  illustrates a cross sectional view of one embodiment of a distal weight member  300 E installed in a golf club  100  utilizing a conventional grip  200 B. As illustrated in  FIGS. 35 and 36 , in some embodiments, the weight members  300 D,  300 E are non-removable and configured to be retained by a conventional grip  200 B, not requiring a cavity  215  to engage within the grip  200 B, and not being removable once the grip  200 B is installed. Both the proximal and distal weight members  300 D,  300 E illustrated in  FIGS. 35 and 36  are configured to be installed in the shaft  110  prior to installing the grip  200 B on the club. A golfer  10  can still go through the fitting process described above, and may even test out clubs utilizing the weight members  300 A,  300 B,  300 C described above, then they can have one or more clubs custom built to their preferred weight distribution utilizing a non-removable proximal weight member  300 D or a non-removable distal weight member  300 E as illustrated in  FIG. 36 . Non-removable weight members  300 D,  300 E, when used herein, describe a weight member which cannot be removed from the golf club  100  without removing the grip  200 B from the shaft  110  of the golf club  100 . 
     The weight members and tools described herein can comprise a variety of materials. In some embodiments, the weight members can comprise one or more materials which may include for example, plastic, aluminum, steel, stainless steel, brass, lead, tungsten, composite, etc. In some embodiments, the heavy weighted portion  315 A,  315 B of the weight member can comprise a denser material than the grip coupling portion  305 A,  305 B or weight rod  320  in order to concentrate the mass of the weight member  300 A,  300 B in a desired location. In some embodiments, the grip expansion tool  600  can comprise one or more materials which may include for example, plastic, rubber, aluminum, steel, stainless steel, composite, etc. In some embodiments, portions of the weight members  300 A,  300 B, or grip expansion tool  600  can utilize fasteners to couple various portions together. In some embodiments, fasteners can comprise for example, threaded fasteners, rivets, etc. In some embodiments, the grip can comprise a flexible material which may include for example, rubber, allowing the grip expansion tool  600  to deform a portion of the grip  200  allowing for installation and removal of a weight member  300 A,  300 B. 
       FIG. 39  illustrates an additional embodiment of a distal weight member  300 B. The distal weight member  300 B can include a grip coupling portion  305 B to engage the butt end of the grip, a heavy weighted portion  315 B spaced from the butt end of the grip, and a weight rod  320  configured to affix the heavy weighted portion  315 B to the grip coupling portion  305 B. Additionally, as discussed earlier, the distal weight member  300 B can include a locating member  325 . As illustrated in  FIG. 39 , the distal weight member  300 B can include a plurality of locating members  325 . The distal weight member  300 B of  FIG. 39  includes two locating members  325 , one above the heavy weighted portion  315 B and one below the heavy weighted portion  315 B. Additionally, a weight member positioning tool  500  can engage the grip coupling portion  305 B and aid in the installation and removal of the distal weight member  300 B from the golf club. 
       FIG. 40  illustrates an exploded view of the distal portion of the distal weight member  300 B illustrated in  FIG. 39 . As illustrated in  FIG. 40 , the heavy weighted portion  315 B can include a bore  316  located at a distal end of the heavy weighted portion  315 B configured to receive a fastener  335 . The fastener  335  passes through the locating member  325  and engages the bore  316 , which may be threaded, affixing the locating member  325  to the distal end of the heavy weighted portion  315 B. Additionally, the heavy weighted portion  315 B can include a bore  316  located at a proximal portion of the heavy weighted portion  315 B configured to receive the weight rod  320 . As illustrated in  FIG. 40 , the distal weight member  300 B can include a rod weight coupling member  710  configured to couple the weight rod  320  to the heavy weighted portion  315 B. The rod weight coupling member  710  can include a rod engaging portion  715 . The rod engaging portion  715  is configured to engage the inside wall of the weight rod  320 . In some embodiments, the rod engaging portion  715  can include a roughened surface configured to enhance bonding between the rod engaging portion  715  and the weight rod  320 . Additionally, the rod weight coupling member  710  can include a weight engaging portion  720  configured to engage the heavy weighted portion  315 B. As illustrated in  FIG. 40 , the weight engaging portion  720  can comprise a male thread configured to engage the bore  316 , which may be threaded, in the proximal portion of the heavy weighted portion  315 B. Finally, the weight engaging portion  720  can be configured to pass through the locating member  325 , affixing the locating member  325  to the proximal portion of the heavy weighted portion  315 B. 
       FIGS. 41 and 42  illustrate one embodiment of a locating member  325 . The locating member  325  can include a plurality of engaging arms  340  and a relief slot  345  between each engaging arm  340 . Additionally the locating member can include a central bore  330  configured to aid in affixing the locating member  325  to the distal weight member  300 B. As illustrated in  FIG. 41 , the engaging arms  340  can be angled upward. 
       FIG. 43  illustrates an alternative version of a locating member  325 . In the illustrated embodiment, a weight sleeve  800  is configured to surround at least a portion of the heavy weighted portion  315 B. The weight sleeve  800  can be affixed to one or more locating members  325 . As illustrated in  FIG. 43 , the weight sleeve  800  can be affixed to a plurality of locating members  325 . In some embodiments, the weight sleeve  800  and locating members  325  can be formed monolithically. The weight sleeve  800  can then be affixed to the exterior of the heavy weighted portion  315 B. 
     In describing the present technology herein, certain features that are described in the context of separate implementations also can be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation also can be implemented in multiple implementations separately or in any suitable sub combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a sub combination or variation of a sub combination. 
     Various modifications to the implementations described in this disclosure may be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other implementations without departing from the spirit or scope of this disclosure. Thus, the claims are not intended to be limited to the implementations shown herein, but are to be accorded the widest scope consistent with this disclosure as well as the principle and novel features disclosed herein.