Dunno if this is the place for it or not, but....
Was recently doing some modifications to my possibles bag... actually, mounting a belt knife on the front strap.... but anyway, I needed to punch some holes, but not being a leather worker really, I only had rudimentary tools and did not want to use the awl from my Swiss Army Knife to make holes with if I could avoid it.
Rummaging around in my print shop stuff, I found my Japanese screw punch. This is a tool that traditional bookbinders use to punch holes for things like Japanese four hole stab bound books. This is a very traditional type of bookbinding not normally encountered by most people. In any case, my Japanese screw punch worked just fine on the leather I needed to put holes in.
If any of you leather-working folks want to try one, here is a link:
Japanese Push Drill Set (Drill & 9 Bits) There is a knock-off sold on Amazon, but I'm given to understand that the quality is not the same. As I had hoped to print and bind my own books, I wanted a tool that would last more than one book, so I spent the extra dollars for the original.