Patent Publication Number: US-9421432-B2

Title: Metal wood club

Description:
RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. patent application Ser. No. 13/875,964, filed May 2, 2013, which is a continuation-in-part of U.S. patent application Ser. No. 13/738,862, filed Jan. 10, 2013, which is a divisional of U.S. patent application Ser. No. 13/206,191, filed Aug. 9, 2011, which is a Divisional of U.S. patent application Ser. No. 12/911,052, filed Oct. 25, 2010, now U.S. Pat. No. 7,997,998, which is a continuation of U.S. patent application Ser. No. 11/560,903, filed on Nov. 17, 2006, now U.S. Pat. No. 7,824,277, which is a continuation-in-part of U.S. application No. 29/245,472, now U.S. Pat. No. D532,474, filed on Dec. 23, 2005, the disclosures of which are all incorporated by reference herein in their entirety. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to an improved golf club. More particularly, the present invention relates to a wood-type golf club head with improved physical attributes. 
     BACKGROUND 
     Golf club heads come in many different forms and makes, such as wood- or metal-type (including drivers and fairway woods), iron-type (including wedge-type club heads), utility- or specialty-type, and putter-type. Each of these styles has a prescribed function and make-up. The present invention relates primarily to hollow golf club heads, such as wood-type and utility-type (generally referred to herein as wood-type golf clubs). 
     Wood-type or metal-type golf club heads generally include a front or striking face, a crown, a sole and an arcuate skirt including a heel, a toe and a back. The crown and skirt are sometimes referred to as a shell. The front face interfaces with and strikes the golf ball. A plurality of grooves, sometimes referred to as “score lines,” may be provided on the face to assist in imparting spin to the ball and for decorative purposes. The crown is generally configured to have a particular look to the golfer and to provide structural rigidity for the striking face. The sole of the golf club is particularly important to the golf shot because it contacts and interacts with the ground during the swing. 
     The complexities of golf club design are well known. The specifications for each component of the club (i.e., the club head, shaft, grip, and subcomponents thereof) directly impact the performance of the club. Thus, by varying the design specifications, a golf club can be tailored to have specific performance characteristics. 
     The design and manufacture of wood-type club heads requires careful attention to club head construction. Among the many factors that must be considered are material selection, material treatment, structural integrity and overall geometrical design. Exemplary geometrical design considerations include loft, lie, face angle, horizontal face bulge, vertical face roll, face size, center of gravity, sole curvature, and overall head weight. The interior design of the club head may be tailored to achieve particular characteristics, such as by including hosel or shaft attachment means, perimeter weighting on the face or body of the club head, and fillers within hollow club heads. Club heads are typically formed from stainless steel, aluminum, or titanium and are cast, stamped, as by forming sheet metal with pressure, forged, or formed by a combination of any two or more of these processes. 
     The club heads may be formed from multiple pieces that are welded or otherwise joined together to form a hollow head, as is often the case of club heads designed with inserts, such as soleplates or crown plates. The multi-piece constructions facilitate access to the cavity formed within the club head, thereby permitting the attachment of various other components to the head such as internal weights and the club shaft. The cavity may remain empty, or may be partially or completely filled, such as with foam. An adhesive may be injected into the club head to provide the correct swing weight and to collect and retain any debris that may be in the club head. In addition, due to difficulties in manufacturing one-piece club heads to high dimensional tolerances, the use of multi-piece constructions allows the manufacture of a club head to a tight set of standards. 
     It is known to make wood-type golf clubs out of metallic materials. These clubs were originally manufactured primarily by casting durable metals such as stainless steel, aluminum, beryllium copper, etc. into a unitary structure comprising a metal body, face and hosel. As technology progressed, it became more desirable to increase the performance of the face of the club, usually by using a titanium material. 
     Players generally seek a metal wood driver and golf ball combination that delivers maximum distance and landing accuracy. The distance a ball travels after impact is dictated by the magnitude and direction of the ball&#39;s translational velocity and the ball&#39;s rotational velocity or spin. Environmental conditions, including atmospheric pressure, humidity, temperature, and wind speed, further influence the ball&#39;s flight. However, these environmental effects are beyond the control of the golf equipment manufacturer. Golf ball landing accuracy is driven by a number of factors as well. Some of these factors are attributed to club head design, such as center of gravity and club face flexibility. 
     Known methods to enhance the weight distribution of wood-type club heads to help reduce the club from being open upon contact with the ball usually include the addition of weights to the body casting itself or strategically adding a weight element at some point in the club. Many efforts have been made to incorporate weight elements into the wood-type club head. These weight elements are usually placed at specific locations, which will have a positive influence on the flight of the ball or to overcome a particular golfer&#39;s shortcomings. 
     The sole of the golf club is particularly important to the golf shot because it contacts and interacts with the ground during the golf shot. There are many sole configurations to optimize the performance of the club. Typically, the sole of the club is slightly curved such that when the club head is placed on the ground, the leading edge is located above the ground. The curvature toward the front of the club generally provides bounce. Bounce assists in preventing the club from digging into the ground and substantially slowing club head speed. The curvature toward the trailing edge generally prevents the club head from getting caught on the ground during the back swing. 
     The present invention is directed to an improved golf club sole for wood-type golf clubs that increases the club&#39;s playability. Additionally, the present invention is directed to an improved weighting system for wood-type golf clubs that increases the club&#39;s playability. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a golf club head comprising a body having a face, a sole, a crown and a skirt joining the face, sole and crown, the body having a heel end and a toe end, wherein the body has an address position with a zero degree bounce portion on the sole and a center sole position with a negative bounce portion on the sole. In one embodiment the negative bounce portion may comprise a negative 0.5 to a negative 4.0 degree surface, or more preferably a least a negative 2.0 degree surface. 
     The negative bounce portion may further comprise a cutaway portion extending to the back of the sole. The cutaway portion may have a depth of about 0.05 to 0.5 inch. The negative bounce portion may have a generally triangular or parabolic shape. The negative bounce portion may be located on the sole a distance of about 0.1 to 1.0 inch from the face of the club head, or more preferably a distance of about 0.35 to 0.65 inches from the face of the club head. The negative bounce portion may have a constant angle or an angle that varies toward the back of the sole. 
     In another embodiment a golf club according to the invention may have a club head with a body having a face, a sole, a crown and a skirt joining the face, sole and crown, the body having a heel end and a toe end, wherein when the toe end is up at least 5 degrees a first measurement of the face measures square, and at a centered position a second measurement of the face measures different from the first measurement. The face may measure at least two degrees more open at the second measurement or at least two degrees open at the second measurement. The centered position may comprise a negative bounce portion. The negative bounce portion may further comprise a cutaway portion extending to the back of the sole. The second measurement of the centered position may occur at club head impact with a golf ball. At the second measurement the shaft angle may measure about 55 to 60 degrees from a ground surface. The first measurement may occur at address position and the shaft angle may measure about 55 to 45 degrees from a ground surface. 
     In another embodiment, the present invention relates to a golf club head comprising a body having a face, a sole, a crown and a skirt joining the face, sole and crown, the body having a center of gravity. The body has a coordinate system with an x-axis located horizontal to the club face, a y-axis located vertical to the club face, and a z-axis located through the club face, and a weight system for the club head, wherein the center of gravity is adjustable at least along the z-axis and the y-axis. The center of gravity is movable within a 6 mm distance along the z-axis, and more preferably within a 4 mm distance along the z-axis. The center of gravity is movable within a 6 mm distance along the y-axis, and more preferably within a 2 mm distance along the y-axis. The center of gravity is movable within a 2 mm distance along the x-axis, and more preferably within a 0.5 mm distance along the x-axis. 
     The weight system may comprise at least one tube for placement within the club head and within a plane formed by the y axis and z axis to adjust the center of gravity. In one embodiment, multiple inserts varying in weight may be placed within the tube at various positions to move the center of gravity to the desired location. Alternatively, a weight is provided at one end of the tube, and the tube is placed within the club head to move the center of gravity to the desired location for a desired ball flight. The tube may be angled downward toward the face of the club head by at least 3 degrees from the z-axis, more preferably about 3 to about 7 degrees. 
     The tube may be flippable, such that the weight is moveable to the other end of the club head to move the center of gravity for a desired different ball flight. When the weight is located at a back of the club head, a shot hit off the club head has increased backspin and a higher launch angle resulting in a softer landing. When the weight is located at a front of the club head a shot hit off the club head has less backspin and a lower trajectory resulting in a shallower landing for increased distance. 
     In one embodiment, the weight comprises tungsten. The weight may have a mass from about 10 grams to about 35 grams. The tube and weight combine to have a mass of about 20 to about 40 grams. The tube may comprise aluminum. The tube may include a fastener on at least one end to assist in fastening the tube in the club head. The tube may be fastened to the inside of the club head adjacent the face. In an alternative embodiment, the tube may be fastened to the outside of the club head substantially flush with the club head body. 
     In an alternative embodiment, the weight system may further comprise three cavities provided in the club head and three separate inserts provided for placement within the cavities, wherein the inserts may have a different mass and may be placed in different cavities to move the center of gravity within the coordinate system. 
     In yet another embodiment, the weight system may further comprise a pipe for placement within the club head to adjust the center of gravity. At least one weight is slidably provided on the pipe to move the center of gravity to the desired location. The slidable weight may be moved along the shaft to the desired location manually from outside of the club head. The pipe may be angled downward toward the face of the club head by at least 3 degrees from the z-axis, and more preferably about 3 to about 7 degrees. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred features of the present invention are disclosed in the accompanying drawings, wherein similar reference characters denote similar elements throughout the several views, and wherein: 
         FIG. 1  is a perspective view of an embodiment of a club head of the present invention; 
         FIG. 2  is bottom plan view of an embodiment of a club head of  FIG. 1 ; 
         FIG. 3A  is a front plan view of an embodiment of a club head according to  FIG. 1  at impact with a golf ball; 
         FIG. 3B  is a front plan view of an embodiment of a club head according to  FIG. 1  at address; 
         FIG. 4A  is bottom plan view of an embodiment of a club head of  FIG. 1 ; 
         FIG. 4B  is a cross-sectional view of the club head of  FIG. 4  taken along line  3 B- 3 B in  FIG. 4 ; 
         FIG. 4C  is a cross-sectional view of the club head of  FIG. 4  taken along line  4 C- 4 C in  FIG. 4 ; 
         FIG. 4D  is a cross-sectional view of the club head of  FIG. 4  taken along line  4 D- 4 D in  FIG. 4 ; 
         FIG. 5  is a back view of the club head of  FIG. 1 ; 
         FIG. 6  is a heel side view of the club head of  FIG. 1 ; 
         FIG. 7A  is a bottom plan view of a club head with the inventive sole of  FIG. 1 ; 
         FIG. 7B  is a cross sectional view of the club head of  FIG. 7A  taken along line  7 B- 7 B; 
         FIG. 8  is a bottom plan view of another alternative embodiment of a club head of the present invention; 
         FIG. 9  is a top plan view of an alternative embodiment of a club head according to the present invention; 
         FIG. 10A  is a front plan view of a club head according to an embodiment of the club head of  FIG. 9 ; 
         FIG. 10B  is a cross-sectional view of the club head of  FIG. 10A , taken along lines  10 B- 10 B; 
         FIG. 11  is a top plan view of the club head according to an embodiment of  FIG. 9 ; 
         FIG. 12A  is a front plan view of a club head according to an embodiment of the club head of  FIG. 9 ; 
         FIG. 12B  is a cross-sectional view of the club head of  FIG. 12A , taken along lines  12 B- 12 B; 
         FIG. 13  is a back perspective cut-out view of an embodiment of a club head according to  FIG. 9 ; 
         FIG. 14  is a back view of the club head of  FIG. 13 ; 
         FIG. 15  is a perspective view of a weight tube according to the embodiment of the  FIG. 13 ; 
         FIG. 16  is a back perspective cut-out view of another embodiment of a club head according to  FIG. 9 ; 
         FIG. 17  is a perspective view of a weight tube according to the embodiment of the  FIG. 17 ; 
         FIG. 18  is a back perspective cut-out view of another embodiment of a club head according to  FIG. 9 ; 
         FIG. 19  is a bottom plan view of another embodiment of a club head according to  FIG. 9 ; 
         FIG. 20  is a front perspective cut-out view of another embodiment of a club head according to  FIG. 9 ; 
         FIG. 21  is a graph depicting the movement of the center of gravity along the y-axis and z-axis according to the embodiment of  FIG. 13 ; 
         FIG. 22  is a graph depicting the movement of the center of gravity along the y-axis and x-axis according to the embodiment of  FIG. 13 ; 
         FIG. 23  is a graph depicting the movement of the center of gravity along the y-axis and z-axis according to the embodiment of  FIG. 16 ; 
         FIG. 24  is a graph depicting the movement of the center of gravity along the y-axis and x-axis according to the embodiment of  FIG. 16 ; 
         FIG. 25  is a perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 26  is an exploded sole view of a golf club head according to the embodiment of  FIG. 25 ; 
         FIG. 27  is a cross-sectional view of a golf club head according to the embodiment of  FIG. 25 , taken across cross-sectional line O; 
         FIG. 28  is an exploded sole view of a golf club head according to a further alternative embodiment of the invention; 
         FIG. 29  is a perspective view of a golf club head in accordance with an alternative embodiment of the present invention; 
         FIG. 30  is an exploded sole view of a golf club head according to the embodiment of  FIG. 29 ; 
         FIG. 31  is a cross-sectional view of a golf club head according to the embodiment of  FIG. 30 , taken across cross-sectional line O; 
         FIG. 32  is an exploded sole view of a golf club head according to a further alternative embodiment of the invention; 
         FIG. 33  is an exploded sole view of a golf club head according to a further alternative embodiment of the invention. 
         FIG. 34  is an exploded view of a weighted insert in accordance with an alternative embodiment of the present invention; 
         FIG. 35  is an exploded view of a weighted insert in accordance with another alternative embodiment of the present invention; 
         FIG. 36  is a cross-sectional view of a weighted insert in accordance with an alternative embodiment of the present invention; 
         FIG. 37  is an exploded view of a weighted insert in accordance with another alternative embodiment of the present invention; 
         FIG. 38  is an exploded view of a weighted insert in accordance with another alternative embodiment of the present invention; 
         FIG. 39  is an exploded view of a golf club head having a weighted insert in accordance with an alternative embodiment of the present invention; 
         FIG. 40  is an exploded view of a weighted insert shown in  FIG. 39 ; 
         FIG. 41  is an enlarged cross-sectional view of a cap of the weighted insert in accordance with an alternative embodiment of the present invention; 
         FIG. 42  is an enlarged cross-sectional view of a weighted insert in accordance with a further alternative embodiment of the present invention; and 
         FIG. 43  is an enlarged cross-sectional view of a weighted insert in accordance with another alternative embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       FIG. 1  shows a golf club head  10  of the present invention. Club head  10  includes a body  12  having a strike face  14 , a sole  16 , a crown  18 , a skirt  20  and a hosel  22 . The body defines a hollow interior volume  24  (See  FIGS. 4B-4D ). Foam or other material may partially or completely fill the interior volume. Weights may be included within the interior volume. The face may be provided with grooves or score lines of varying design. The club head has a toe  26  and a heel  28 . 
     A golf club shaft (not shown) is attached at hosel  22  and is disposed along a shaft axis A-A. The hosel  22  may extend to the bottom of the club head  10 , may terminate at a location between the sole and crown portions  16  and  18  of the head  10 , or the hosel  22  may terminate flush with the crown portion  26 . 
     It is recommended that the inner volume  24  have a volume greater than 125 cubic centimeters, and more preferably greater than 175 cubic centimeters. Preferably, the mass of the inventive club head  10  is greater than 150 grams, but less than 220 grams; although the club head may have any suitable weight. The body  12  may be formed of sheets welded together or cast, preferably from steel, aluminum or titanium or any other suitable material or combination thereof. 
     The strike face  14  may be made by milling, casting, forging or stamping and forming. The face  14  may be made of any suitable material, including titanium, titanium alloy, carbon steel, stainless steel, beryllium copper, and other metals or composites. The face  14  may have any suitable thickness, and may be uniform or varied. As will be appreciated, the face  14  may be connected to the body  12  by any suitable means, including bonding and welding. Alternatively, the body  12  and face  14  may be cast simultaneously forming a homogeneous shell and eliminating the need to bond or otherwise permanently secure a separate face  14  to the body  12 . Alternatively, the sole  16  or crown  18  may be formed separately and fitted to the remainder of the body  12  as is known to those of skill in the art. 
     The sole  16  preferably has a complex shape that accomplishes two objectives. The first objective is to provide a surface for the club head  10  to sit on in the address position that squares the face  14  to the target. The second objective is to provide a sole shape that gives more clearance to the ground at impact than would be available in a club head with a conventional sole. In order to achieve the first objective, an address portion or zero degree bounce portion  30  is provided. This portion is a sufficient area on the sole  16  on which the club head  10  may rest when placed at the address position by a golfer. The zero degree bounce portion  30  may be a flat portion provided on the sole  16 . The zero degree bounce portion  30  may be directly centered behind the face  16  or, as illustrated, may be provided more toward the heel  28 . As illustrated in  FIGS. 1 and 2 , the sole  16  has a zero degree bounce portion  30 , such that at address the club head  10  rests at this point and the face  14  is square to the target. The zero degree bounce portion  30  enables the club head  10  to sit just as a conventional club head without a sole having a complex shape. Thus, the complex sole of the inventive club head  10  does not adversely affect the way the club head sits at address. 
     In order to achieve the second objective, a portion of the sole  16  is relieved to give it a multi-relief surface  32  with a negative bounce. Preferably, a negative bounce portion  34  is provided on the sole  16  in a center portion that is spaced from the face  14  of the club head  10 . Thus, the club head  10  has two areas of bounce. As illustrated in  FIGS. 3A and 3B , the impact position I p  of the club head  10  is different than an address position A p  because the dynamics of the golf swing cause the shaft to flex at impact thereby moving the position of the club head  10 .  FIG. 3B  illustrates the club head at address where the face is square to the target, the shaft axis A-A creates an angle with the ground G called the shaft angle β a . As illustrated in  FIG. 3A , during impact, the club head is rotated a few degrees upright, and the shaft axis A-A creates a different angle with the ground G called shaft angle β i . 
     It will be appreciated that in one embodiment the toe  26  may be up at least 5 degrees at a first measurement, for example when the club head  10  sits at address, such that the face  14  measures square. At a second measurement, for example during impact with a golf ball, taken at a centered position the face  14  measures differently than the first measurement. For example, the face  14  may measure at least two degrees more open at the second measurement than the first measurement, or at least two degrees open at the second measurement than the first measurement. The centered position may comprise the negative bounce portion  34 , which may be a substantially flat surface. When the first measurement occurs at the address position, the shaft angle β a  preferably measures about 55 to 45 degrees. When the second measurement occurs at impact of the club head  10  with a golf ball, the shaft angle β i  measures about 55 degrees to 60 degrees. 
     As illustrated in  FIGS. 1 and 2 , the sole  16  features a multi-relief surface  32  to provide greater ground clearance at the trailing edge  36  of the sole  16  to minimize turf resistance. With this construction, the ground/sole contact point remains forward toward the leading edge  38  of the strike face  14 . Maintaining a forward ground/sole contact point improves directional control and ball flight, by reducing the potential of the club head  10  to bounce or skip onto the ball. This is particularly true of players that play the ball forward in their stance, or who sweep the ball from the turf with a shallow angle of attack. Preferably, the multi-relief surface  32  sole features the negative bounce portion  32  and a cutaway portion  40 . 
     The negative bounce portion  34  may have any desired overall shape; preferably the negative bounce portion  34  has a triangular shape as shown in  FIGS. 1 and 2 .  FIGS. 4A-4D  illustrates the negative bounce portion  34  and cutaway portion  40  in the sole  16 . Cross-sectional views illustrated in  FIGS. 4B and 4D  show cutaway portion  40  in comparison with the regular surface  42  of a conventional club head sole.  FIG. 4B  illustrates the cross-sectional view of the center section of the club head  10  with the negative bounce portion  34  and cutaway portion  40  in comparison with the regular surface of a conventional club head sole  42 . 
     The cutaway portion  40  extends from the negative bounce portion  34  to the trailing edge  36  of to the club head  10 . As illustrated in  FIGS. 4B-D , the cutaway portion  40  continues and may gradually increase the negative surface from the plane S running along the bottom of the sole. Preferably, the cutaway portion  40  has a depth d cp  of about 0.05 to 0.5 inch from the regular surface of a conventional club head sole  42 ; this depth may or may not be constant.  FIGS. 5 and 6  illustrate the back  44  and heel  28  of the club head. The full extent of the cutaway portion  40  can be envisioned. 
       FIGS. 7A-7B  illustrate the sole  16  of the club head  10  and a cross-sectional view through line  7 B- 7 B which illustrates the multi-relief surface  32  of the sole  16 . The negative bounce portion  34  is spaced a distance D 1  from the strike face, where D 1  is preferably about 0.1 to 1.0 inch. More preferably, D 1  is about 0.35 to 0.65 inch from the strike face  14  of the club head  10 . The distance D 1  may be different for different club heads as it may depend on the face progression and the loft of the club head. As illustrated, the negative bounce portion  34  comprises a surface having an angle α from a plane S running along the bottom of the sole  16  parallel to the z-axis of a coordinate system running through the club head. The negative bounce portion  34  comprises about a negative 0.5 to a negative 4.0 degree surface, such that the angle α is about negative 0.5 to 4.0 degrees from the plane S. Preferably, the negative bounce portion  34  comprises about a negative 2.0 degree surface. It will be appreciated that the negative bounce portion  34  may have a constant angle or may have an angle that varies toward the back of the sole. The negative bounce portion  34  may have locations with multiple radii. 
     As illustrated, the multi-relief surface  32  includes both the negative bounce portion  34  and the cutaway portion  40  and these form a triangular shape. The triangular shape forms an angle φ, angle φ is preferably about 35 to 50 degrees, and more preferably about 38 to 44 degrees. The negative bounce portion  34  and cutaway portion  40  have a length L, length L is preferably about 1 to 5 inches, and more preferably about 2 to 4 inches. 
       FIG. 8  shows an alternative embodiment for the sole  16 . The club head  46  features a multi-relief sole  32  as described above. The multi-relief sole features the negative bounce portion  34  and the cutaway portion  40 . It will be appreciated that the negative bounce portion  34  and cutaway portion  40  may have any suitable shape. 
     In general, to increase the sweet spot, the center of gravity of the club head is moved toward the bottom and back of the club head. This permits an average golfer to launch the ball up in the air faster and hit the ball farther. In addition, the moment of inertia of the club head is increased to minimize the distance and accuracy penalties associated with off-center hits. In order to move the weight down and back without increasing the overall weight of the club head, material or mass is generally taken from one area of the club head and moved to another. Materials can be taken from the face of the club, creating a thin club face, the crown and/or sole and placed toward the back of the club. 
       FIG. 9  illustrates a top of a club head  50  according to another embodiment of the present invention. Club head  50  includes a body  52  having a strike face  54 , a sole  56  (see  FIGS. 10A and 10B ), a crown  58 , a skirt  60  and a hosel  62 . The body defines a hollow interior volume  64  (See  FIGS. 10B and 12B ). The face may be provided with grooves or score lines of varying design. The club head has a toe  66  and a heel  68 . 
       FIG. 9  illustrates the center of gravity (c.g.) along the x-axis and z-axis. In order to improve playability of the club head  50  it is desired to be able to move the c.g. within the club head  50  to a more optimal position. Preferably, the club head  50  features a weight system  70  (see  FIGS. 10A-10B and 12A-12B ) to move the c.g. within the club head  50  to a more optimal position. Preferably, the c.g. is movable within a 6 mm distance along the z-axis in comparison to a club head without the weight system. More preferably, the c.g. is movable within a 4 mm distance along the z-axis. The c.g. may be movable within a 6 mm distance along the x-axis in comparison to a club head without the weight system, more preferably within a 2 mm distance, and still more preferably within a 0.5 mm distance. Additionally, the c.g. is moveable within a 6 mm distance along the y-axis in comparison to a club head without the weight system (See  FIG. 10A-10B and 12A-12B ). Preferably the c.g. is moveable within a 2 mm distance along the y-axis. 
     The c.g. adjustability may not substantially affect the dynamic loft of the club head. For example, for a 3 mm front-back c.g. shift the dynamic loft changes about 0.4 degrees. When the c.g. is moved back, the backspin may increase, for example between 100 and 300 rpm per 3 mm of c.g. movement toward the rear of the club head. 
       FIG. 10A  illustrates the front face  54  of the club head showing the x-axis and the y-axis.  FIG. 10B  is a cross-sectional view taken along lines  10 B- 10 B of  FIG. 10A .  FIG. 10B  depicts the inside of the club head featuring a weight system  70  according to the invention, and the c.g. may be moved along the z axis and y axis. 
       FIG. 10B  depicts the weight system  70  as a tube  72  placed within the club head  50  within a plane formed by the y-axis and z-axis to adjust the c.g. of the club head. As illustrated in  FIG. 11 , it will be appreciated that more than one tube  72  may be provided within the club head  50 . As illustrated in  FIG. 10B , the weight system  70  features a tube  72  with a weight  74  at one end  76  of the tube  72 . As shown in  FIG. 10B , the weight  74  is placed the back of the club head  50  to move the c.g. to a desired location for desirable ball flight. When the weight  74  is located at a back of the club head  50 , a shot hit off the club head  50  has increased backspin and a higher launch angle resulting in a softer landing. In an alternative embodiment, it will be appreciated that the tube  72  may feature multiple inserts varying in weight for placement within the tube  72  to move the c.g. of the club head  50  to a desired location. 
     As illustrated, the tube  72  is preferably provided at an angle within the club head  50 . The tube  72  is angled downward toward the face  54  of the club head  50 , such that the tube  72  is provided within the plane formed by the z-axis and y-axis. The tube  72  may be angled by an angle δ, where δ is at least 1 degree from the plane W formed by the z axis and x axis. Preferably, the tube is angled downward toward the face  54  by at least 3 degrees from the plane W formed by the z-axis and x-axis. More preferably, the tube  72  is angled downward toward the face of the club head  50  by about 3 to 7 degrees from the plane W formed by the z-axis and x-axis. It will be appreciated that although the tube  72  is described herein as being provided within a plane formed by the y-axis and z-axis, the tube  72  may be offset in either direction from that plane by any desired amount. 
     Now referring to  FIG. 12A-12B , it will be appreciated that the tube  72  may be flipped within the club head  50 , such that the weight  74  is provided at the other end  76  of the club head  50 , closer to the face  54 , to move the c.g to a different location for desirable ball flight. When the weight  74  is located at a front of the club head  50  a shot hit off the club head  50  has less backspin and a lower trajectory resulting in a shallower landing for increased distance. It will be appreciated that the tube  72  itself may be able to be inserted in the club head with the weight  74  in either direction, or that different tubes  72  may be selectable with the weight  74  at the desired end and then provided in the club head. 
     It will be appreciated that a club having the weight system  70 , such as the tube  72  and weight  74 , may also include the multi-relief surface  32  on the sole  56  as described above. For example, in  FIGS. 10B and 12B  the sole  56  may feature a multi-relief surface  32  with a negative bounce portion  34  and a cutaway portion  40  as described above. It will also be appreciated that the angle δ of the tube may be substantially parallel to the multi-relief surface  32 . 
       FIG. 13  illustrates how the tube  72  may be inserted into the club head  50 . A sheath  78  extending from a block  79  in the club head  50  receives the tube  72  with the weight  74 , and a fastener  80  locks the tube  72  in place within the club head  50 . The tube  72  is fastened to the outside of the club head  50  substantially flush with an outer surface  82  of the club head, as illustrated in  FIG. 14 . 
       FIG. 15  illustrates the tube  72  according to the embodiment of  FIG. 13 . The weight  74  is provided at an end  76  of the tube  72 . It will be appreciated that the tube  72  and weight  74  may be joined by threaded engagement, epoxy, mechanical lock or other joining method. The weight  74  may comprise tungsten or any other suitable material. The weight  74  has a mass of about 10 to 25 grams. The combined mass of the tube  72  and weight  74  is about 20 to 40 grams. Preferably, the tube  72  comprises aluminum, although any other suitable material may be used. 
     It is envisioned that the orientation of the tube  72  may be set during manufacture, may be modified by the user, or may be modifiable by the manufacturer or a designated fitting location. The tube  72  has a diameter t d  of about 0.3 to 0.5 inch and a length t l  of about 2 to 3 inches. It will be appreciated that more than one tube  72  could be provided in the club head  50  at any one time as illustrated in  FIG. 11 , or that multiple tubes  72  with a different mass may be provided to the user or fitting location. 
       FIG. 16  illustrates an alternative embodiment for placement of the tube  72  within the club head  50 . In this embodiment, the tube  72  has threads  84  on both ends  86  and  88  that interlock in threaded engagement to the mating threads  90  on a block  92  inside the club head adjacent the face  54  and threads  94  on a block  96  adjacent the skirt  60  of the club head  50 . The tube  72  is fastened to the inside of the club head  50  adjacent the face  54 . It is envisioned that the orientation of the tube  72  may be set during manufacture, may be modified by the user, or may be modifiable by the manufacturer or a designated fitting location. 
       FIG. 17  illustrates the tube  72  of the embodiment of  FIG. 16  showing the dual threaded ends  86  and  88  of the tube that may be inserted in either direction into the club head  50  and threadedly received adjacent the face  54 . The tube  72  has a diameter t d  and a length t l  as described above and the weight  74  and tube  72  have a similar mass as described above. The exterior of the tube  72  would align substantially flush with the outer surface  82  of the club head  50 . 
       FIG. 18  shows an alternative embodiment for the weight system  70  where a weight  98  may be slid along a pipe  100  provided in the club head  50 . The exterior surface  102  of the sole  56  of the club head  50  may feature a mechanism  104  to move the weight  98  along the pipe  100  to the desired location to move the c.g. for the desired ball flight as described above. Alternatively, the position of the weight  98  on the pipe  100  may be set during manufacture of the club head. 
       FIG. 19  features another alternative embodiment for the weight system  70 . This embodiment features two or more cavities  106  in the sole  56  of the club head  50  for receiving inserts  108 . The cavities  106  may be placed in any desired location on the club head  50 . As illustrated, the three cavities  106  are provided along an axis O offset from the x-axis. The cavities  106  may be aligned parallel to the x-axis or may be offset in either direction. The cavities  106  may be provided on an axis O offset from the x-axis by 0 to 90 degrees in either direction. The back portion  110  of the club head may feature deeper cavities  106  to mimic the angle of the tube  72  described above relative to the plane formed by the z-axis and x-axis. The inserts  108  may have different mass and may be placed in the different cavities  106  to move the c.g. to a desired location. The inserts  108  may be movable by the user, or they may be set at the time of manufacture or modifiable in a fitting environment. 
       FIG. 20  illustrates yet another alternative embodiment of the weighting system  70  for moving the center of gravity along the y-axis. As illustrated, the club head  50  features a vertical cavity  112  extending from the sole  56  into the hollow volume  64  of the club head. The cavity  112  may be placed in any desired location in the sole  56 , for example centered along the width of the face  54  and located more toward the back of the club head  50 , as illustrated. A weight  114  is made to fit within the cavity  112 , such that it mates securely within the cavity  112 . It will be appreciated that the weight  114  may be secured in the cavity in any suitable manner, including threaded engagement, epoxy, mechanical lock, or other joining method. As illustrated, the cavity  112  is cylindrical and the weight  114  is a corresponding cylindrical plug, although it will be appreciated that the weight  114  and mating cavity  112  may be any suitable shape and size. The weight  114  features a heavy end  116  and a lighter end  118 . The heavy or lighter end  116  and  118  may be placed closer to the sole  56  to move the c.g. to the desired location along the y-axis. It is envisioned that the orientation of the orientation of the weight  114  may be set during manufacture, may be modified by the user, or may be modifiable by the manufacturer or a designated fitting location. This embodiment may assist in isolating just one attribute, moving the c.g. along the y-axis, thereby making club fitting more straight forward. 
     As illustrated in  FIG. 21 , the movement of the c.g. is illustrated based on the construction of  FIG. 13 . It illustrates the movement of the c.g. along the y-axis and z-axis between a normal Titleist 904F fairway wood without a weight system, a club head  50  with the weight system  70  of  FIG. 13  having the weight  74  in the back of the club head  50 , and a club head  50  with the weight system  70  of  FIG. 13  having the weight  74  in the front of the club head  50 .  FIG. 21  illustrates the relative position of the c.g. along the y-axis and z-axis for these various club heads. 
     As illustrated in  FIG. 22 , the movement of the c.g. is illustrated based on the construction of  FIG. 13 . It illustrates the movement of the c.g. along the y-axis and x-axis between a normal Titleist 904F fairway wood without a weight system, a club head  50  with the weight system  70  of  FIG. 13  having the weight  74  in the back of the club head  50 , and a club head  50  with the weight system  70  of  FIG. 13  having the weight  74  in the front of the club head  50 .  FIG. 22  illustrates the relative position of the c.g. along the y-axis and x-axis for these various club heads. 
     As illustrated in  FIG. 23 , the movement of the c.g. is illustrated based on the construction of  FIG. 16 . It illustrates the movement of the c.g. along the y-axis and z-axis between a normal Titleist 904F fairway wood without a weight system, a club head  50  with the weight system  70  of  FIG. 16  having the weight  74  in the back of the club head  50 , and a club head  74  with the weight system  70  of  FIG. 16  having the weight  74  in the front of the club head  50 .  FIG. 23  illustrates the relative position of the c.g. along the y-axis and z-axis for these various club heads. 
     As illustrated in  FIG. 24 , the movement of the c.g. is illustrated based on the construction of  FIG. 16 . It illustrates the movement of the c.g. along the y-axis and x-axis between a normal Titleist 904F fairway wood without a weight system, a club head  50  with the weight system  70  of  FIG. 16  having the weight  74  in the back of the club head  50 , and a club head  50  with the weight system  70  of  FIG. 16  having the weight  74  in the front of the club head  50 .  FIG. 24  illustrates the relative position of the c.g. along the y-axis and x-axis for these various club heads. The locations of the c.g. shown in  FIGS. 21-24  were calculated using a commercially available CAD (computer aided design) system. 
       FIG. 25  of the accompanying drawings shows a perspective view of a golf club head  250  in accordance with an alternative embodiment of the present invention. This embodiment of the present invention has one or more cavities  206  in the sole of the club head  250  for receiving a weighted insert  208 . The cavity  206  in this embodiment may generally be shown in a generally elongated cylindrical shape with an opening  211  that exposes the cylindrical weighted insert  208  to the sole of the golf club head  250 . The orientation of the cavity  206  and the weighted insert  208  may generally be offset at an angle from the striking face of the club head to promote the change in the center of gravity of the club head  250  along two or more axis. In order to show the offset angle of the weighted insert  208 ,  FIG. 26  is provided showing an exploded sole view of a golf club  250  having a weighted insert  108  in accordance with this alternative embodiment of the present invention. 
       FIG. 26  of the accompanying drawings shows an exploded sole view of a golf club  250  having a weighted insert  208 . More specifically,  FIG. 26  shows the cavity  206  and the weighted insert  208  aligned along an axis O that is offset from the x-axis at an angle θ. This angle θ, similar to the prior discussion in  FIG. 19 , may generally be offset from the x-axis by an angle of 0 to 90 degrees in either direction, but more preferably between about 0 to about 90 degrees in the positive direction, more preferably between about 3 to about 45 degrees, and most preferably between about 5 to about 35 degrees all without departing from the scope and content of the present invention. Having the axis O offset from the x-axis is beneficial to the present invention because it allows the weighted insert  208  to alter the center of gravity of the golf club head along the x-axis and the z-axis simultaneously, depending on the orientation of the weighted insert  208 . However, in order to achieve this, the weighted insert  208  must within itself, have some inherent weighting characteristics that favor such an extreme movement in the center of gravity. 
     The exploded view of the golf club  250  with the weighted insert  208  shown in  FIG. 26  also allows the inherent weighting characteristics of the weighted insert  208  to be shown. In this figure, the weighted insert  208  may be further comprised of a heavy end  216 , a lighter end  218 , and a cap  219 . The utilization of a heavy end  216  and a lighter end  218  in this type of weighted insert  208  maximizes the bi-directional adjustability of the elongated cylindrical weighted insert  208  to shift the center of gravity of the golf club head  250 . In a first orientation, when the heavy end  216  is located close to the cap  219  near the toe end of the golf club head  250 , the center of gravity of the golf club head is shifted forward and toe-ward relative to the neutral position; while in a second orientation, when the heavy end is located away from the cap  210  near the heel end of the golf club head  250 , the center of gravity of the golf club head will be shifted rearward and heel-ward relative to the neutral position. 
     Due to the nature of the orientation of the weighted insert  208  being at an orientation that is offset from the x-axis, combined with its internal weighting components with a heavy end  216  and a lighter end  218 , the length of the weighted insert  208  becomes important; as an increase in the length of the weighted insert  208  results in a greater effect on the center of gravity of the golf club head  250 . Hence, in order to achieve a discernible change in the center of gravity of the golf club  250  by the change in orientation of the weighted insert  208 , the length of the weighted insert  208  may generally be between about 50 mm to about 100 mm, more preferably between about 60 mm to about 90 mm, even more preferably between about 70 mm to about 80 mm. 
     The heavy end  216  of the weighted insert  208  may generally be comprised of a material having a relatively high density such as tungsten with a density of greater than about 10.9 g/cm 3 ; however numerous other materials may be used without departing from the scope and content of the present invention so long as it has a density greater than the remainder of the weighted insert  208 . The lighter end  218  of the weighted insert could be made out the same tungsten material as the heavy end  216 , but in a smaller volume. However, alternative materials for the lighter end  218  such as steel, titanium, or any other material having a density greater than the central part of the weighted insert  208  all without departing from the scope and content of the present invention. The central portion of the weighted insert  208  may generally be juxtaposed and placed between the heavy end and the lighter end. In order to maximize the effects of the heavy end  216  and the lighter end  218 , the central portion of the weighted insert  208  may generally be made out of a lightweight material such as carbon fiber composite, aluminum, magnesium, plastic, or any other lightweight material with a density of less than about 2.5 g/cm 3  all without departing from the scope and content of the present invention. 
     In the embodiment shown, the threaded cap  219  may help retain the weighted insert  208  using a compressive force as shown in the cross-sectional view shown in  FIG. 27 . However, in alternative embodiments of the present invention, the cap  219  may be magnetic in nature to further enhance the bond between the cap  219  and the weighted insert  208 . 
     In order to illustrate the inner workings of the weighted insert  208  and the golf club  250 ,  FIG. 27  is provided here with a cross-sectional view of the golf club head  250  along cross-sectional line O, as shown previously in  FIG. 26 . The cross-sectional view of the golf club head  250  allows the relationship between the weighted insert  208 , the heavy end  216 , the lighter end  218 , the cap  219 , and the cavity  206  to be shown in more detail. As it can be seen in  FIG. 27 , the cavity  206  may generally have a chamfered portion around its terminal end, matching the geometries of the extremities of the heavier end  216  and the lighter end  218  to allow either the heavier end  216  or the lighter end  218  to sit inside the cavity  206 . Another feature worth identifying in this cross-sectional view is the difference in the construction of the heavy end  216  and the lighter end  218 . In order to create the mass difference between the heavy end  216  and the lighter end  218 , the heavy end  216  could be a dense solid piece of tungsten, while the lighter end  218  could be a hollow piece of tungsten. In alternative embodiments of the present invention, the lighter end  218  could even be made out of lightweight material such as aluminum, steel, or any other material having a density lower than tungsten all without departing from the scope and content of the present invention. In a further alternative embodiment of the present invention lighter end  218  may even be formed out of the same piece as the remainder of the weighted insert  208  without departing from the scope and content of the present invention. In order to further exaggerate the weighting effects, the central portion of the weighted insert  208  may generally be a hollow composite type material, as shown in the cross-sectional view in  FIG. 27 . Finally,  FIG. 27  shows a threaded cap  219  to coincide with a threaded entry portion of the cavity  206  to secure the weighted insert  208  within the cavity  206 . 
     In an alternative embodiment of the present invention, the central portion of the weighted insert  208  could have some mass properties of its own. In one example, the central portion could have its own heavier side and a lighter side, creating even more weighting adjustments. In one setting, the heavier side  216  could be on the same side as the heavier side of the central portion, creating an ultra-heavy side and an ultra-light side to the weighted insert  208 . However, in another setting, the heavier side  216  could be paired with the lighter side of the central portion, with the weighting characteristics of the components cancelling each other out to create a more neutral setting. 
     In a further alternative embodiment of the present invention, the cap  219  may contain a see through window within the “cavity of the opening” to allow the user to see the terminal surface of the weighted insert  208 . The window, in one exemplary embodiment, may be made out of see through flexi-glass, however, numerous other materials may be used to provide a see through window without departing from the scope and content of the present invention. Having a see through window will allow the orientation of the weighted insert  208  to be seen without the need to disassemble the weighted insert  208  from the cavity  206 . In order to achieve this, the end surfaces of the weighted insert  208  could be painted different colors, with each of the two different colors indicating whether the lighter end  218  or the heavy end  216  is shown. 
     It should be noted that in this embodiment, the body portion of the weighted insert  208  is exposed to the external sole portion of the club head  250 , which allows an external component such as a sleeve  213  to be used to adjust the way the club head  250  contacts a ground plane.  FIG. 28  of the accompanying drawings shows this exploded view of an alternative embodiment of the present invention wherein an additional sleeve  213  is added to the assembly, coinciding with the exposed portion  211  of the cavity  206 . The sleeve, as it can be seen, may generally circumferentially encompass the external surface of the weighted insert  208  to create the change in sole contact. In this embodiment, the sleeve  213  could be a triangular shape with each edge of the triangle having a different angle, thus creating three different methods for the golf club  250  to rest on the ground plane. However, numerous other geometries such as a cylindrical rod, a rectangular rod, an oval rod, or any other shape without departing from the scope and content of the present invention so long as it is capable of creating multiple different sole contacts. In a further alternative embodiment, the external walls of the sleeve  213  could even be tapered to create more of a change in the sole contact. The creation of different sole contact planes allows the golf club head to compensate and change for differences in the loft, lie, or even the face angle of the golf club head  250 . 
     Moving on to  FIG. 29 , a perspective sole view of a golf club head  250  in accordance with a further alternative embodiment of the present invention is shown. More specifically, the golf club head  250  shown in this embodiment is very similar to the golf club head  250  shown in  FIGS. 25-28 , except that the weighted insert  208  extends through the internal cavity of the golf club head  50  without being exposed to the sole portion of the golf club head. The weighted insert, although only exposed at the extremities, still have a cavity  206  at one end to allow the weighted insert to be used. 
     The exploded sole view of the golf club head  250  shown in  FIG. 30  illustrates that the current embodiment still has the weighted insert placed along the axis O that is offset from the x-axis. The angle θ, similar to before, may generally be between about 0 to about 90 degrees in the positive direction, more preferably between about 3 to about 45 degrees, and most preferably between about 5 to about 35 degrees all without departing from the scope and content of the present invention. To illustrate the internal geometry of this alternative embodiment, a cross-sectional view is shown in  FIG. 31  to provide and show how the weighted insert  208  is completely contained within the walls of the club head  250 . 
       FIGS. 32 and 33  shows exploded sole views of club heads  250  in accordance with further alternative embodiments of the present invention. More specifically, the club heads  250  shown here may generally be smaller sized metalwood type club heads such as a fairway wood or a hybrid type club heads  250 . It should be noted here that these embodiments illustrate a very important relationship between the volume of the golf club head  250  and the angle θ of the weighted insert  208  relative to the x-axis. Because the adjustment of the center of gravity of the golf club head  250  is a very specific art form, the angle θ of placement of the weighted insert  208  along the sole is a key factor. More specifically, the relationship between the angle θ and the volume of the club head  250  could be quantified as an Angle to Volume Ratio, wherein the Angle to Volume Ratio is defined as the angle θ of the placement of the weighted insert  108  divided by the volume of the club head  250 . The current invention, may generally have an Angle to Volume Ratio of between about 0.02 degrees/cc to about 0.25 degrees/cc, more preferably between about 0.05 degrees/cc to about 0.25 degrees/cc, most preferably between about 0.10 degrees/cc to about 0.20 degrees/cc. 
       FIG. 34  of the accompanying drawings shows an exploded view of a weighted insert  208  in accordance with an alternative embodiment of the present invention. The weighted insert  208  has a heavy end  216  piece of the weighted insert  208  and a light end  218  piece of the weighted insert  208  being created by cylindrical pieces that removably slide around a bolt  220 . By reversing the orientation of the heavy end  216  piece and the light end  218  piece, the center of gravity of the weighted insert  208  could be adjusted without departing from the scope and content of the present invention. Needless to say, in alternative embodiments of the present invention there could be more than two weight members with different mass properties without departing from the scope and content of the present invention. 
       FIG. 35  of the accompanying drawings shows an exploded view of a weighted insert  208  in accordance with a further alternative embodiment of the present invention. The weighted insert  208  in this embodiment may be comprised of a heavy end  216  piece and a light end  218  piece, both fitting internally in a tube  221 . Similar to the embodiment above, reversing the orientation of the heavy end  216  piece and the light end  218  piece can alter the center of gravity of the weighted insert  208 , which can result in change of the center of gravity of the golf club head in general. 
       FIG. 36  of the accompanying drawings shows a cross-sectional view of a weighted insert  208  in accordance with an even further alternative embodiment of the present invention. In this embodiment of the present invention, the weighted insert  208  may contain a heavy end  216  piece that is threaded externally like a screw. The external threads of the heavy end  216  piece may then engage internal threads in the tube to allow the heavy end  216  piece to provide an infinitesimal amount of adjustment settings throughout the threaded region of the tube. The heavy end  216  piece is rotated within the tube via a tool that engages the heavy end  216  piece via an opening in one side of the weighted insert  208 . 
       FIG. 37  of the accompanying drawings shows an exploded view of a weighted insert  208  in accordance with an even further alternative embodiment of the present invention wherein an alternative cap  219  is used. The cap  219  in this embodiment of the present invention may contain a pin  223  with a ball  224  at the end of the cap  219  to engage a “church key” shaped notch or slot  225 . This ball and notch embodiment will allow the cap to be centered onto the weighted insert  208  and prevent the cap from being lost during disassembly and assembly. Although  FIG. 37  only shows the ball and notch in the heavy end  216  portion of the weighted insert  208 , the same geometry can be incorporated into the light end  218  to provide interchangeability of the orientation without departing from the scope and content of the present invention. 
       FIG. 38  of the accompanying drawings shows an exploded view of a weighted insert  208  in accordance with an even further alternative embodiment of the present invention. In this embodiment, the cap  219  is retained together with the weighted insert  208  using a snap fit  226  type mechanism that hooks onto a recessed rim  227  on the weighted insert  208  itself. In an alternative embodiment, the snap fit  226  could also be made out of a detent type mechanism that prohibits the cap from separating from the weighted insert  208  without departing from the scope and content of the present invention. It is worth noting that the weighted insert  208  has a recessed rim  227  at both the heavy end  216  and the light end  218 , so the cap  219  could be placed at either extremity of the weighted insert without departing from the scope and content of the present invention. 
       FIG. 39  of the accompanying drawings shows an exploded view of a golf club  250  in accordance with a further alternative embodiment of the present invention. The weighted insert  208  in this embodiment be further comprised of a tube  230  to shield the weighted insert  208  from contact with any potential debris in the cavity of the golf club head  250 . In this embodiment the tube  230  may generally have a diameter that is slightly bigger than the diameter of the weighted insert  208 , and be snap fit into the cavity  206  without departing from the scope and content of the present invention. However, in other embodiments, the tube  230  may also be threaded into position in the cavity  206  instead of being snap fit in to provide more structural rigidity also without departing from the scope and content of the present invention. Furthermore, the tube  230  may also be glued into place without departing from the scope and content of the present invention. 
     In a preferred embodiment of the present invention, the tube  230  may generally be made out of a plastic type material in order to create this barrier against debris without adding additional weight to the weighted insert. However, numerous other material could be used without departing from the scope and content of the present invention so long as it provides a cover for the weighted insert. 
       FIG. 40  provides a close up view of the tube  230  in accordance with an embodiment of the invention as shown in  FIG. 39 . As it can be seen, the tube  230  has a notched opening, lengthwise along the entire length of the tube  230 . This opening allows the tube to compress and reduce its diameter when it is being inserted into the cavity  206  shown in  FIG. 39 . When the tube decompresses thereby expanding its diameter, it will generally snap into a specific orientation within the cavity of the golf club head leaving the opening facing the crown portion of the golf club head. In an alternative embodiment of the present invention, the opening could be faced towards the back or front of the golf club head to promote to help with the stress levels without departing from the scope and content of the present invention. Having the opening of the tube facing the crown portion of the golf club head is beneficial because most of the debris in the cavity of the golf club head tends to be located towards the sole portion of the golf club head. In addition to the debris, it is common knowledge that a type of glue is usually injected into the internal cavity of the golf club head to make final adjustments to the club head weight. This glue type material, if it comes in contact with the weighted insert  206 , may prevent it from being movable and interchangeable. In order to prevent this undesirable effect, the tube  230  cover is created to prevent such a contact. 
       FIG. 41  of the accompanying drawings shows an enlarged partial cross-sectional view of a weighted insert  208  in accordance with a further alternative embodiment of the present invention. In this embodiment, instead of using a snap fit or detent mechanism to secure the cap  219  to the heavy end  216  of the weighted member  208 , a clip  231  is used to secure the cap  219  to the weighted insert  208 . 
       FIG. 42  of the accompanying drawings shows an enlarged partial cross-sectional view of a weighted insert  208  in accordance with another alternative embodiment of the present invention. In this embodiment, the weighted insert is retained in the golf club head in tension rather than in compression as all of the previous embodiments have shown. In this embodiment, there is a slidable retainer  235  that can travel lengthwise along the weighted insert  208  to provide a stopping point for the weighted insert  208 . Once the retainer  235  is engaged, a screw can be used to secure the weighted insert in the cavity. 
       FIG. 43  of the accompanying drawings shows an enlarged partial cross-sectional view of a weighted insert  208  in accordance with another further alternative embodiment of the present invention. In this embodiment of the present invention, the weighted insert  208  is neither in tension nor compression. Rather, the weighted insert may have threads on both the heavy end  216  and the light end  218  to more securely attach the weighted insert  208  to the golf club head. 
     While various descriptions of the present invention are described above, it should be understood that the various features of each embodiment could be used alone or in any combination thereof. Therefore, this invention is not to be limited to only the specifically preferred embodiments depicted herein. For example, the multi-relief surface sole may be combined in one club head with the weight system to move the c.g. of the club head. Further, it should be understood that variations and modifications within the spirit and scope of the invention might occur to those skilled in the art to which the invention pertains. Accordingly, all expedient modifications readily attainable by one versed in the art from the disclosure set forth herein that are within the scope and spirit of the present invention are to be included as further embodiments of the present invention. The scope of the present invention is accordingly defined as set forth in the appended claims.