Need some help. I just finished my 3rd shot at making a raised setting to replace a gold setting on a ball Pocket Watch 3rd wheel upper setting. I made the setting out of brass and stilled the outer lip after all the other work. The setting sits perfectly in the plate. The original setting has small cut-ins in the setting to allow the two screws to screw in flush with the plate. How can I make these little 1/3 moon cut-ins?  Here are some shots of the settings and my really messy desk:) now clea