How to make a trigger for a slingshot or an easier trigger 

There are already a lot of videos on my channel on how to make crossbows or bows ... But I want to try something new. And the idea came to me to make a homemade slingshot for hunting or fishing. But before starting to make a slingshot at home, I began to study what is the most difficult thing to make. And I saw a new word for myself - a trigger for a slingshot. As always, you could buy but I like to do everything myself. I did not find drawings of a trigger for a slingshot on the Internet. I had to use the experience of making a trigger for a crossbow. I do everything for the first time, so do not judge strictly. A lot of things I will alter, finish.