Search:

Put it between two boards and clamp it tight for a long time. I don't know if you have the materials to do that, but you'd need a lot of clamping pressure, and the boards need to be smooth and clean...

I'll offer a differing opinion. I wouldn't do anything to the leather if it's clean and smooth. Here's what I would do. I would clamp it to something (where the hardware would be) or fit it to...