Hello - I need to punch some venting holes in the crown of a leather helmet, and I have no idea how to do this. I've always punched holes in flat leather against a flat cutting board back. I need to place my punch (1/2" punch tool to be struck with a hammer) on the outside of the dome and punch through to the inside against a solid back.
I'm struggling with what to use on the inside as something solid and round to punch against, and my best guess would be a hockey puck.
Please help with suggestions if any of you have done this before.
Mitch