When using bar clamps, the screw end should be completely retracted and the friction catch brought to bear on the surface to be clamped.

Question

Quizplus · Accepted Answer

This is because the friction catch, also known as the clutch, is what determines the amount of pressure applied to the workpiece. If the screw end is not retracted, it will interfere with the clamping mechanism and may cause damage to the workpiece. Therefore, it is important to fully retract the screw end before engaging the friction catch when using bar clamps.

When Using Bar Clamps, the Screw End Should Be Completely