Hi,

Here's a very crude but handy little gizmo I made to press a countersunk recess into a steel washer using a big vice. I made it a few years ago, long before I got a lathe...and as you can see it is as simple as you like, bit of a Gem barrel with the end bored out to form a simple die and a cut-down wood screw as punch, but it works so well that I haven't bothered making anything fancier for the purpose since...

What little jigs or tools have you made and use?