So as to not highjack the oven thread I'm posting this one. On suggestion from Mike, 45D, and others,
I decided to install an action shield on a defective hammer I had on hand for a trial run. Rather than drill the hammer I wanted to slot and solder the shield in place. It was easy, using a dremel cut off wheel to slot the hammer (Mikes suggestion) and soft solder. Looks like it would work with maybe some trimming on the curl. Next gun I shoot and clean I'll make the installation and pack with grease.