Get a thin steel wire, trim the end of a toothpick.
Insert the hook part at the back of the body, and put a 3d printed pin through the body of the bow and the hock hole.
Insert the trigger and put the other 3d printed pin in through the body of the bow and the trigger hole.
Insert the steel wire through the bow holes and twist it on itself
Glue with epoxy glue the bow to the body.