The black part represents the bowstring.
When the bowstring is pulled, it is hold between the brown caliper heads because the pink slider at its back position prevents the brown caliper heads from reaching the open positions.
When the green trigger is dragged, the pink slider will move forwards to open the caliper heads.
See how to use a mechanical bow release:
[ Ссылка ]

STEP files of this video:
[ Ссылка ]
Inventor files of this video:
[ Ссылка ]

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