I've always had the upmost respect for you fellows willing to build locks. Very refined and "English". It'll be a dandy when polished case hardened and blued. I've never seen a fly quite like that before. The geometry should smooth out the interruption. When I was building single-trigger guns the trick was to eliminate the fly.
When I worked at Green River Forge (in a previous lifetime) we had occasion to move a workbench that hadn't budged for a very longtime. I think we found 5 Siler Lock flys underneath and behind.
