Tandy leather ( chain leather outlets) sell bags of scrap that I used to make mine. They will show you how to burnish ( I think that’s what they called it) edge’s very easy. I bought some other tools and leather while I was there and made my own 3/4” sling (very simple) all was like 50.00 a year ago. Watch a you tube video, it’s that easy. I had never done leather work before that. The leather punch with rotating head and different sizes comes in handy and was cheap, but you could just drill holes in leather for your screws to go through.