I was replacing the hammer leather on a Lenzkirch today, a customers mantel clock. I thought someone may appreciate a tip or two when doing this. Cut the leather, enough to fold over. Soak it in water with a some PVA glue in it. I added a little more water in the mix you see below. Fold it over, shape it in a split stake, and close it up in a vice Take it out when dried up Cut to length, glues it in, and shape the end with sand paper.