Smart hole punch, i dont have a old fork, only have one and that's a bendy handle(lol)
Might use a Saw blade for It wich is used on the Bahco brand hacksaws for Wood. I also Saw An old mauntainbike at the garbage so might try to get a gearing from it and sharpen the points so i have a roller punch, if none Will work out il use my fork to press Dots in the leather and Just use An awl