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The trigger lever has a slightly loose hole for the pin.
The lever and pin trigger is probably the simplest lock one can make for a crossbow.
The basic principle is very simple: when a lever is squeezed, a pin attached to it pushes the bowstring from it's catch, releasing it.
There are a few generic ways to optimize the smoothness of the release with this type of lock: Here we describe the following variant: The trigger lever operates in a shallow groove carved to the stock. The sides of the groove are rounded, so that yanking the trigger sideways does not split them.
The front part of the groove becomes noticeably deeper right after trigger's pivot point.
Regardless of it's apparent simplicity there is a big difference between one that works and one that is a pleasure to shoot.