Cup your hand slightly to form an air trap and force the sleeve down over the piston assembly with a rapid slap (hard) on the open end of the diaphragm with your cupped hand.

• 手稍微窝成杯状，形成一个气罩，用杯状的手迅速拍击在隔膜的开口端上，将套筒往下压到活塞总成的上面。