Since we're talking about neat/handy/favorite tools, this automatic 5" center punch made by Rennsteing, is my my most used tool in my hobby shop, it has never missed a punch ,and can really leave a visible dimple on steel:
If you do consider buying one, make sure it's the 5" not the 3/4", the smaller 3/4" did not perform nearly as well so I returned it.
If you do consider buying one, make sure it's the 5" not the 3/4", the smaller 3/4" did not perform nearly as well so I returned it.

Rennsteig 5" Automatic Adjustable Center Punch, RN430230 - - Amazon.com
Rennsteig 5" Automatic Adjustable Center Punch, RN430230 - - Amazon.com
www.amazon.com
