Release mechanism for cord

Hi, I had the idea to this while i was ill on a weekend and had nothing to do. I stumbled uppon a video of an really old slingshot release mechanism out of germany. I thought that i could make this more compact and usable for a model crossbow, with the advantage that you can easily activate the trigger no matter under how much force is put on the cord that is hold by the mechanism. After three days workig on it the first prototype was functional. After a bit finetuning on the modely everything w