Cup head screws, When should adjust the handwheel on the frame, the first to loosen the screw so that fixed the handwheel.
杯头螺丝；当要调节手轮在机架上的位置时，先要松开此螺丝，以便固定手轮。
Cup head screws, When should adjust the handwheel on the frame, the first to loosen the screw so that fixed the handwheel.
杯头螺丝；当要调节手轮在机架上的位置时，先要松开此螺丝，以便固定手轮。
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