Shaft sleeve: Sure to change sleeve when its surface is rough and damaged seriously.
轴套：表面粗糙及损伤严重时，更换轴套。
Shear sleeve adapter allows ball to be run in place or dropped from surface;
采用剪切球座配合接头，能够确保投球从地面投放或送入到位；
Shear sleeve adapter allows ball to be run in place or dropped from surface;
采用剪切球座配合接头，能够确保投球从地面投放或送入到位；
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