0 the part of the head (= top part) of a hammer that is opposite the flat end and can be of various shapes:
The other hammer has a peen tip with a cylindrical die.
The hammerhead consists of a slightly bevelled flat head as well and a rounded cross peen.
It's like attacking a battleship with a ball peen hammer.
You can practise on scrap pieces of metal before trying to peen your scythe blade.
