Do not twist a pusher up to the end. It can lead to that the lock-nut will get stuck in a coupling pedal in operating time that, in turn, will lead to pusher breakage. If all of you changed length of a pusher, do not forget to check a lock-nut gap before squeezing of a pedal of coupling. Besides, do not draw a pusher lock-nut. If to strip a thread, the main cylinder can get stuck that will cause refusal of system of coupling.