Carl, it is called jacking leather, you will see buckets and cups made out of hardened or jacked leather. I have a good friend that makes jackware but I never asked him how he does it. See if you can find someone that makes jackware and they can tell you exactly how to boil the leather to jack it. If you can find a contact for Paul Claus, maybe on the CLA site. He will answer your questions, he is a great guy. I just never contacted him at home, we do too many shows together and that is where we talk....