I've tried before, but I am design challenged and have always ended up cross and frustrated when I have tried. Very naughtily the punch arrived at the weekend and I have a v quick go so that I would know how to design it.
The first pic is from the punch and the second is the cutting file that I have made. Looks good I think! I kept designing it the wrong way around so that the waste was the negative if you see what I mean, but I got my head round it in the end! Nothing major design wise but for me its a