The box can¡¯t extend freely, even can¡¯t move when in the worst condition.
Reason 1£ºLack of lubricant between box & sleeve hole.
solution1: Fuel the oil before working according to the regulation from the instruction book and at the same time, flip the handle several times.
reason 2£ºThe backlash between box & tremata is too small and it becomes smaller as the temperature changes.
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