| 摘要 |
A forward component has a frusto-conical forward section terminating in a recess and a cylindrical rearward section terminating with male screw threads. A rearward component has a cylindrical forward section terminating with female threads and a rearward section with a cylindrical recess. A support, removably positioned within the forward and rearward components, has a frusto-conical leading region, an intermediate region, and a cylindrical trailing region. A plurality of annular weights with cylindrical apertures are positioned on the trailing region of the support.
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