本实用 新型的优点：气缸内活塞成为活塞螺母和花键轴一体的零件；
The utility model has the advantages of that: the piston in the gas cylinder becomes a part of the whole of piston-nut and spline shaft;
每个活塞都要拆下来并且打磨，每个螺母和垫圈都要清洗或更换，并且一个都不能少。
Each piston disassembled and polished, each nut and washer cleaned or replaced, accounted for.
每个活塞都要拆下来并且打磨，每个螺母和垫圈都要清洗或更换，并且一个都不能少。
Each piston disassembled and polished, each nut and washer cleaned or replaced, accounted for.
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