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Trigger
— a variation of the mechanism used exclusively in F-shaped clamps (see "Design"). In such tools, the movable sponge is equipped with a handle with a trigger guard (trigger), when you press this bracket, the sponge moves a few millimetres in the direction of compression. Thus, to secure the clamp, you need to press the trigger several times; a special lever is provided to open the clamp. Trigger F-clamps are somewhat more expensive and more bulky than screw clamps, and it is also difficult to adjust the clamping force in them; but they work much faster.