Abstract:
Game apparatus, e.g., a game racquet or a golf club, with selectively variable and maintainable weight distribution, e.g. by moving material (e.g., liquid and/or solid weight members) within or on the apparatus and selectively positioning the weight(s) and maintaining weight position in or on the apparatus.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present invention and application claim priority under the United States Patent Laws from U.S. Application Ser. No. 60/860,408 filed Nov. 21, 2006, incorporated fully herein for all purposes. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    This invention is directed to game racquets, to game racquets with selectively positionable weight(s), and to racquets with maintenance apparatus for maintaining a weight or weights in a desired position in or on a racquet. 
         [0004]    2. Description of Related Art 
         [0005]    The prior art discloses a wide variety of game racquets and golf clubs. 
         [0006]    The following U.S. Patents—listed simply as examples and not as an exhaustive list—disclose a variety of prior art racquets: U.S. Pat. Nos. 5,772,540; 5,454,562; 5,322,280; 5,240,247; 5,232,220; 5,219,166; 5,217,223; 5,211,398; 5,197,732; 5,188,260; 5,174,568; 5,172,911; 5,171,011; 5,098,098; 4,984,792; 5,512,574; 4,330,125; 4,340,225; 4,275,885; 4,273,331; 4,182,512; 4,057,250; 4,027,881; 3,931,968; and 3,907,292, all of which are incorporated fully herein for all purposes. 
       BRIEF SUMMARY OF THE INVENTION 
       [0007]    The present invention, in one aspect, discloses a game racquet with a handle portion and a body portion across which are stretched a plurality of strings, the strings connected to the body. The body portion or part thereof is hollow and/or the handle or part thereof is hollow. Material (liquid and/or liquid with a solid or solids) and/or one or more movable weight members are movably disposed within a hollow part and are movable, either by hand or when the racquet is swung, tilted or inverted, from one location to another, e.g. to the top of the racquet to change the weight distribution of the racquet during a hit or serve. Alternatively, a channel member or a weight member (or plurality thereof) are releasably located on the body of a racquet. A golf club according to the present invention has a hollow channel extending from a club shaft into a space in a club head, a weight member or members and/or liquid in or on the shaft movable to the head. 
         [0008]    The present invention discloses, in at least certain embodiments, a game racquet with: a body, part of the body defining a body opening therethrough; a plurality of strings across the body opening and connected to the body; an interior channel extending through at least a portion of the body, the interior channel having at least a first part and a second part; weight material (liquid and/or solid member or members) movably disposed in the interior channel for movement between the first part and the second part; and maintenance apparatus adjacent (in and/or on or near) the interior channel for selectively maintaining the weight material in one of the first part and the second part. 
         [0009]    Weight relocation, in certain embodiments, moves (and/or enlarges) a racquet&#39;s sweetspot to another location in the racquet, in one aspect to relocate the sweetspot, and in one aspect toward or to the top of the racquet enhancing a player&#39;s ability to hit the ball at the sweetspot and/or enhancing the force with which a player hits a ball. After a hit of a ball or a serve, tilting or re-inversion of the racquet results in movement of the liquid or weight (s) moving back to an original position; or in certain embodiments the movable material moves down in a handle, thus decreasing the amount of energy needed to move and swing the racquet in play in certain ways after the serve or after a hit of the ball. 
         [0010]    In certain aspects, in a racquet or club according to the present invention, movable weights are used which are spherical such as solid spheres, ball bearings or marbles made from a material of desired density to achieve a desired weight (e.g. metal, stone, composite, plastic). In another aspect a lubricant may be used with weight member(s). In another aspect movable weight(s) are configured to conform with an exterior shape or interior shape of a portion or of a hollow portion of a racquet or a club. 
         [0011]    In another embodiment an amount of a liquid (e.g. but not limited to water, alcohol, oil and antifreeze—or any combination thereof) or a liquid with objects, solids, weights, or particles therein, is movably disposed in part of a hollow body; or in an embodiment in which the handle is hollow, initially in the hollow handle. Upon tilting, swinging in an arc, or inversion of the racquet or club, the liquid flows in the hollow part (and/or weight member or members), in one aspect toward the top of the hollow body member of a racquet or to a head of a club, and due to centrifugal force stays there during arcing movement of a hit, drive, or serve. 
         [0012]    In certain embodiments in which a liquid or a solid movable weight or weights are used, a selectively actuable maintenance apparatus maintains the weight(s) in a desired location (e.g. in a top area of a racquet or in the handle of a racquet) and prevents the repositioing of weight(s) (liquid and/or solid) which have moved from one part to another. With practice, a player can allow less than all of the movable weight to move from one part to another in the body. 
         [0013]    In another embodiment in which an amount of material (liquid and/or a weight member or members) is in the hollow body and/or hollow handle, the maintenance apparatus is a valve device which allows a player to selectively permit some or all of the material to move from one location to another in or on the racquet. 
         [0014]    In certain embodiments movable weight members and/or liquid are introducible onto or into a racquet&#39;s hollow body and/or handle or into a club shaft through one or more holes or openings; and may be selectively removed therethrough, e.g. after a hit, drive, or serve. 
         [0015]    In certain aspects a racquet or club according to the present invention has a channel member with a hollow channel therein affixed (permanently or releasably) to a body (e.g. a racquet frame, club shaft, or club head) and weight material (liquid and/or solid member or members) as described herein is movable in the channel member. In one aspect the channel member is tubing (flexible or rigid) with the material therein. In one aspect the tubing is releasably connectible to the body, e.g. with friction fit connectors or clasps, with adhesive, with hook-and-loop releasably cooperating fastener material like VELCRO (Trademark) material, and/or with one or more wrap-around strings, wires, belts, loops and/or straps. The tubing can be sealed permanently or it can have one or more openable or pluggable closures for inserting and/or removing material (liquid and/or a weight member or members). A flexible tubing can be formed to fit a plurality of racquets or clubs with different body shapes or curvatures. Any maintenance apparatus disclosed herein can, according to the present invention, be used with any channel member or tubing disclosed herein. 
         [0016]    In certain embodiments the present invention discloses a golf club with a body with any channel or channel member as described herein for containing material to flow to a head of the golf club upon swinging of the club; and/or with a weight movable in or on club shaft. the present invention discloses, in certain embodiments, a golf club with: a head, the head having an interior space therein; a shaft connected to the head; weight material movably disposed with respect to the shaft for movement between a first position with respect to the shaft and a second position with respect to the shaft. In one aspect, the head has an interior hole, the shaft is hollow, the weight material is within the shaft, and part of the shaft extends into the hole in the head so that the weight material is movable into the interior space in the head. The weight material is liquid or is at least one weight member or a plurality of weight members movably within or secured around the shaft. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0017]    A more particular description of embodiments of the invention briefly summarized above may be had by references to the embodiments which are shown in the drawings which form a part of this specification. These drawings illustrate certain preferred embodiments and are not to be used to improperly limit the scope of the invention which may have other equally effective or legally equivalent embodiments. 
           [0018]      FIG. 1A  is a front view of a racquet according to the present invention. 
           [0019]      FIG. 1B  is a side view of the racquet of  FIG. 1A . 
           [0020]      FIG. 2A  is a front view of a racquet according to the present invention. 
           [0021]      FIG. 2B  is a side view of the racquet of  FIG. 2A . 
           [0022]      FIG. 3A  is a front view of a racquet according to the present invention. 
           [0023]      FIG. 3B  shows the racquet of  FIG. 3A  inverted. 
           [0024]      FIG. 3C  is a front view of a racquet according to the present invention. 
           [0025]      FIG. 3D  is a front view of a racquet according to the present invention. 
           [0026]      FIG. 4A  is a front view of a racquet according to the present invention. 
           [0027]      FIG. 4B  is a side view of the racquet of  FIG. 4A . 
           [0028]      FIG. 4C  is a front view of a racquet according to the present invention. 
           [0029]      FIG. 4D  is a side view of the racquet of  FIG. 4C . 
           [0030]      FIG. 4E  is a cross-section view of a weight member and pin for use with the racquet of  FIG. 4C . 
           [0031]      FIG. 5A  is a front view of a racquet according to the present invention. 
           [0032]      FIG. 5B  is a side view of the racquet of  FIG. 5A . 
           [0033]      FIG. 6  is a front view of a racquet according to the present invention. 
           [0034]      FIG. 7  is a front view of a racquet according to the present invention. 
           [0035]      FIG. 7A  is an end view of weight member according to the present invention. 
           [0036]      FIG. 7B  is an end view of weight member according to the present invention. 
           [0037]      FIG. 7C  is an end view of weight member according to the present invention. 
           [0038]      FIG. 8A  is a front view of a racquet according to the present invention. 
           [0039]      FIG. 8B  is a front view of a channel member of the racquet of  FIG. 8A . 
           [0040]      FIG. 8C  is a side view of the racquet of  FIG. 8A . 
           [0041]      FIG. 9  presents cross-section views of items according to the present invention. 
           [0042]      FIG. 10  is a front view of a racquet according to the present invention. 
           [0043]      FIG. 10A  is a side view of a weight member usable with the racquet of  FIG. 10 . 
           [0044]      FIG. 11  is a side view of a golf club according to the present invention. 
           [0045]      FIG. 12  is a side view of a golf club according to the present invention. 
           [0046]      FIG. 13  is a side view of a golf club according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0047]    Referring now to  FIGS. 1A and 1B , a game racquet  10  has a handle  12  and a body  14  to which are connected and across which are stretched a plurality of strings  13 . The handle  12  is hollow, but in certain embodiments may be solid or partially solid. A plurality of movable weight members  8  are movably disposed in an interior channel  15  (shown in dotted lines) in the body  14  and handle  12 . Upon swinging or inversion of the racquet  10 , the weight members  8  move from an interior  16  of the handle  12  to a top  18  of the body  14 . Upon arcing movement of the racquet  10 , e.g. during a serve or other movement of the racquet, centrifugal force maintains the weight members at the top  18  of the body  14 . Upon tilting or re-inversion of the racquet, the weight members  8  move back down into the interior  16  of the handle  12 . (it is to be understood that any racquet according to the present invention and any racquet described below has strings, e.g. strings like the strings  13 .) 
         [0048]    Referring now to  FIGS. 2A and 2B , a game racquet  20  has a handle  22  and a body  24  to which are connected and across which are stretched a plurality of strings  23 . One or more movable metal ball bearings  28  are movably disposed in an interior channel  25  in the body  24 . Upon inversion of the racquet  20 , the ball bearings  28  move to a top  26  of the body  24 . Upon arcing movement of the racquet  20 , e.g. during a serve or other swing or movement of the racquet, centrifugal force maintains the ball bearings  28  at the top  26  of the body  24 . Weight member(s) such as the ball bearings  28  are introducible into the interior channel  25  and removable therefrom through a hole  27  in the body  24 . The channel  25  may be any desired length and the hole  27  may be located as desired, in one aspect so that the weight members may be located as desired, and in one aspect so that the weight members will not fall out upon inversion of the racquet. Upon tilting of the racquet, the weight members move back to the hole  27  for removal from the body  24 . Only one weight member  28  may be used. Alternatively liquid or liquid with solids is introduced through the hole  27  (and tape or a plug is used to close off the hole  27 ). 
         [0049]    Referring now to  FIGS. 3A and 3B , a racquet  30  according to the present invention has a handle  32  and a body  34  with an interior channel  35  therethrough and strings  31  (shown in  FIG. 3A ). An amount of liquid  33  is movably disposed in the interior channel  35 . Upon inversion of the racquet  30 , the liquid  33  moves from the handle  32  to a top  38  of the body  34 . Upon arcing movement of the racquet  30 , e.g. during a serve or other movement of the racquet, centrifugal force maintains the liquid at the top  38  of the body  34 . Upon re-inversion of the racquet the liquid moves back down into handle  32 . As may be done with any racquet according to the present invention, the liquid  33  may be replaced with any weight member(s) disclosed herein and/or liquid may be used in combination with weight member(s). 
         [0050]    As shown in  FIG. 3C , a racquet  30   a  (like the racquet  30 ) has a handle  32   a  and a body  34   a  with a solid portion at the top and with an interior channel  35   a  which extends from the handle  32   a  up into a portion of both sides of the body  34   a.  Upon inversion of the racquet  30   a,  liquid and/or weight members in the interior channel  35   a  moves from the handle  32   a  to abut portions  38   a,    38   b  of the solid portion at the top of the body  34   a.    
         [0051]    As may be the case with any racquet according to the present invention, the solid portion at the top of the body  34   a  may be of any desirable extent, e.g. with the portions  38   a,    38   b  located as desired; similarly the extent of the interior channel within the handle  32   a  may be any desired length—thus affecting how much liquid and/or weight member(s) is/are contained in the racquet and the location of the liquid and/or weight members upon inversion of the racquet. 
         [0052]    It is within the scope of the present invention to provide a plurality of separate, discrete, distinct interior channels within the handle and/or body of a racquet or in the shaft and/or head of a golf club with liquid and/or weight members in each channel. The channels may be of any desired extent (and, as is true of any racquet or club according to the present invention, any channel may be of any desired diameter or largest dimension). As shown in  FIG. 3D  a racquet  30   d  according too the present invention (like the racquet  30 ) has a body  34   d  with a handle  32   d.  Upon inversion of the racquet  30   d,  the liquid and/or weight member(s) in interior channels  35   d  (in the handle and body) and interior channel  3   9   d  (at the top of the body) moves to the top of the respective channel. Liquid and/or weight member(s) in the handle portion of the interior channel  35   d  will move to abut solid portions  38   e,    38   f  of a solid part  38   d  of the body. Optionally, either channel  35   d  or  39   d  may be deleted. 
         [0053]    Referring now to  FIGS. 4A and 4B , a game racquet  40  has a handle  42  and a body  44  across which are stretched a plurality of strings  46 . A movable weight member  48  is movably disposed in an interior channel  45  in the body  44 . A stem  43  connects the weight member  48  to a projection or knob  41  located exteriorly of the body  44  with the stem  43  movable in a slit  49  along the body  44  from a lower point to a top  47  of the racquet  40  to move the weight member within the channel  45 . In another aspect the channel  45  may extend down any distance into the handle  42 , e.g. but not limited to, to its lower extremity if desired. With a friction fit, the stem  43  can be held in position in the slit  49 . At least one, one, two, three, four, five, or more weight members may be used. 
         [0054]      FIG. 4C and 4D  show a racquet  40   a  (like the racquet  40 ) but with a frame  44   a  having a channel  45   a  extending from within a handle  42   a  to a top of the frame. Within the channel  45   a  are one, two, three or more weight members  48   a.  A pin  49  (see, e.g. pin  49  in  FIG. 4D ) is insertable into, and removable from, a hole  49   a  through the frame (any desired member of holes  49   a  may be provided for maintaining the weight members  48   a  in a desired location in the channel  45   a ). Optionally, as shown in  FIG. 4E  in cross-section, a weight member  48   a  may have a recess  48   r  sized and located for receipt therein of a pin  49  (extending through a hole in the frame) to hold the weight member  48   a  in position in the channel  45   a.    
         [0055]    Referring now to  FIGS. 5A and 5B , a game racquet  50  has a handle  52  and a body  54  across which are stretched a plurality of strings (not shown). A plurality of movable weight members  58  are movably disposed in an interior channel  55  in the handle  52  and the body  54 . Upon inversion of the racquet  50 , the weight members  58  move from handle  52  to a top  56  of the body  54 . Upon arcing movement of the racquet  50 , e.g. during a swing, serve or other movement of the racquet, centrifugal force maintains the weight members at the top  56  of the body  54 . Upon re-inversion of the racquet the weight members move back down into the handle  52 . A stop pin  57  has a shaft  51  which is removably and releasably insertable through a hole  59 . A crossmember  53  facilitates manipulation of the stop pin  57 . The stem  51  protruding into the channel  55  (after the weight members  58  have moved to the top  56  of the racquet  50 ) prevents the weight member(s) (one or more may be used as desired) from moving back into the handle  52 . The stop pin  57  may be selectively removed, e.g. after a serve, to allow the weight members  58  to return to the handle  52 . Additional holes  59  may be provided as shown near a yoke  54   a  or in the handle  52  for using the pin  57  to maintain the weight member(s) in other locations. 
         [0056]    Referring now to  FIG. 6 , a game racquet  60  has a handle  62  and a body  64  across which are stretched a plurality of strings (not shown). An amount of liquid  63  is movably disposed in an interior channel  65  in the handle  62  and the body  64 . A valve  70  has a stem  71  which blocks liquid flow in the channel  65  until the stem  71  is turned using a head  73  so that a hole  72  through the stem  71  is aligned with openings  68  and  69  of the channel  65 . The head  73  protrudes exteriorly of the body  64  and facilitates manipulation and rotation of the valve stem  71 . Upon inversion of the racquet  60  with the valve  70  open the liquid  63  moves from the handle  62  to a top  66  of the body  64 . Upon re-inversion of the racquet  60  the liquids move back down into the handle  62 . Such a valve may be located anywhere on the body  64  to maintain liquid in a desired location; and multiple valves may be used. 
         [0057]    A racquet  70  according to the present invention as shown in  FIG. 7  has a frame  74  with a handle  72 , a yoke  77 , and a top area  73 . A weight member  78  is connected to the top area  73 . It is within the scope of the present invention to use one, two, three or more weight members  78  and, as shown in outline, to place it or them in other desired locations on the frame  74 . In certain aspects the weight member(s)  78  are permanently formed of or permanently or semi-permanently connected to the frame  74 . In other aspects, the weight member(s)  78  are releasably connected to the frame  74 , e.g. with a friction fit of a grasp member (e.g. the grasp member  75  as shown in  FIG. 7A ) or with amounts of releasably cooperating hook-and-loop fastener material (e.g. as amounts  79   a,    79   b ); legs  75   a  of the grasp member  75  may be deleted in one aspect and the amounts  79   a,    79   b  alone releasably holding the weight member(s) in place. In other aspects the weight member(s)  78  are located within the frame  74 . As shown in  FIG. 7B  a weight member  78   b  may have a grasp member  75   b  with legs  75   c  having a shaped portion  75   d  shaped to conform to a shape of a racquet body for enhanced holding of the weight member of the body.  FIG. 7C  shows a weight member  78   f  with a body  78   g  from which a pointed projection  78   h  extends. The projection  78   h  is received in a corresponding hole  78   k  in the frame  74 . The projection  78   h  can be so formed and made of such flexible material that pulling on the weight member  78   f  releases the weight member  78   f  from the hole  78   k.    
         [0058]      FIG. 8A and 8B  show a game racquet  80  according to the present invention with a frame  84 , a handle  82  and a yoke area  87 . A hollow tubing member  78  is connected (permanently or releasably) to the frame  84 . Any material disclosed herein (liquid and/or weight member or members) is used within the hollow tubing, e.g. material  78   a  shown schematically in dotted lines. The tubing member  78  may be permanently formed of or secured to the frame  84 ; or it may be releasably connectible to the frame  84  in any suitable manner, e.g. using the items, materials, and/or connectors used to releasably connect a weight member  78  ( FIG. 7A ) to its frame. Optionally, the tubing may be of any desired length and may provide, exterior to a racquet body or frame (or club part), any interior channel disclosed herein, including, but not limited to, those of  FIGS. 1A-6 . 
         [0059]      FIG. 9  presents a variety of cross-sectional shapes for any channel disclosed herein, any frame hole, any tubing, any racquet body or frame disclosed herein, and any weight member disclosed herein. With appropriate sizing, any weight member of any cross-sectional shape may be used in any channel of any cross-sectional shape. 
         [0060]      FIG. 10  shows a racquet  100  according to the present invention with a frame  104 , handle  102 , plurality of strings  106  across a frame opening  107 , and a top area  105 . A hole  110  extends through the top area  105 . A weight member (e.g., like the weight member  112 ,  FIG. 10A ), is releasably insertable into the hole  110 . One, two, three or more holes  110  may be used, each with a weight member releasably located therein. 
         [0061]      FIG. 11  shows a golf club  120  according to the present invention with a head  122  to which is connected a club shaft  124 . A weight member  78   p  is releasably connected to the head  122  (connected as is any weight member disclosed and discussed herein). A weight member may be connected to any portion of the head  122  and, as shown in dotted lines, to the shaft  124  (and may be located anywhere on the shaft  124 ). 
         [0062]      FIG. 12  shows a golf club  140  according to the present invention with a head  142  connected to a club shaft  144 . An interior channel  148  in the shaft  144  is in communication with an interior space  146  in the head  142 . The space  146  may be any desired shape (including the shapes shown in  FIG. 9 ). A plurality of weight members  145  are in the space  146  as shown in  FIG. 12 . Upon inversion of the club  140 , the weight members  145  move from the space  146  into the channel  148  to a top end of the channel  148  (which upon inversion of the club becomes the lowermost part of the club). Upon swinging of the club to hit a golf ball, the weight members are moved forcefully down the channel  148  back toward the space  146  and then into the space  146  augmenting the force of the head  142  hitting the ball as the head  142  hits the ball. A removable cap  149  selectively closes off the channel  148 . Liquid or liquid and weight member(s) may be sued in the channel  148  for movement into the space  146 . A single weight member may be used. 
         [0063]      FIG. 13  shows a golf club  160  according to the present invention with a head  162  to which is connected a club shaft  164 . A hollow tubing member  168  is connected to the shaft  164 . Weight members  165  are within the tubing member  168  (only one weight member or two or more may be used). The tubing member  168  may extent only to the head&#39;s exterior or optionally, as shown in dotted lies, the tubing member  168  may extend into a hole  169  in the head  162  (and the weight member or members will be movable into and out of the head. The hole in the head  162  may extend to any point in the head so that the tubing member and weight member(s) moving therein can extend anywhere into the head  162 . 
         [0064]    The present invention, therefore, in at least certain embodiments, provides a game racquet with: a body, part of the body defining a body opening therethrough; a plurality of strings across the body opening and connected to the body; an interior channel extending through at least a portion of the body, the interior channel having at least a first part and a second part; weight material movably disposed in the interior channel for movement between the first part and the second part; and maintenance apparatus adjacent the interior channel for selectively maintaining the weight material in one of the first part and the second part. Such a game racquet may have one or some (in any possible combination) of the following: the weight material is liquid; the liquid is antifreeze; the weight material is at least one solid member; the at least one solid member is a plurality of solid objects; the body has a first hole, the first hole in communication with the interior channel, and the maintenance apparatus comprises a pin removably inserted into the first hole so that part of the pin projects into the interior channel and maintains the weight material at a desired location in the interior channel; the weight material is a solid member, the solid member having a secondary hole, a portion of the pin projecting into the secondary hole; the body has a second hole, and the pin selectively insertable into the first hole to maintain the weight material in the first part of the interior channel, the pin insertable into the second hole to maintain the weight material in the second part of the interior channel; the weight material is at least one movable weight member, the at least one movable weight member having a body with a stem projecting from the body into the slit, the maintenance apparatus is a slit in the body in communication with the interior channel, and the stem movable in the slit to selectively position the movable weight member in the interior channel at a desired location therein; wherein the at least one movable weight member has a knob exterior of the body, the knob connected to the stem; the weight material is liquid flowable between the first part and the second part, the maintenance apparatus is a valve member with a valve stem, the stem having a flow hole therethrough, and the stem located in the interior channel, the stem rotatable to stop fluid flow in the channel from the first part to the second part and the stem rotatable to selectively allow the liquid to flow through the stem from one of the first part or the second part of the interior channel to the other of the first part of the second part of the interior channel; a head connected to the stem, the head exterior to the interior channel, the head rotatable to rotate the stem; and/or the body is a main body and tubing is connected to the main body, the interior channel extending through the tubing. 
         [0065]    The present invention, therefore, in at least certain embodiments, provides a body, part of the body defining a body opening therethrough; a plurality of strings over the body opening; at least one hole through the body; a weight member removably secured in the at least one hole. Such a game racquet may have one or some (in any possible combination) of the following: the at least one hole is a plurality of holes, including a first hole and a second hole, the first hole spaced apart from the second hole, and the weight member selectively insertable into either the first hole or the second hole; and/or wherein the body has a handle and a top area, the first part of the interior channel is in the handle, and the second part of the interior channel is in the top area. 
         [0066]    The present invention, therefore, in at least certain embodiments, provides a golf club with: a head, the head having an interior space therein; a shaft connected to the head; weight material movably disposed with respect to the shaft for movement between a first position with respect to the shaft and a second position with respect to the shaft. Such a game racquet may have one or some (in any possible combination) of the following: wherein the head has an interior hole, the shaft is hollow, the weight material is within the shaft, and part of the shaft extends into the hole in the head so that the weight material is movable into the interior space in the head; and/or wherein the weight material is at least one weight member movably secured around the shaft.