Looks to me like there is not enough material on the suspect sear to reshape it --the cowboy way would be to peen it with a flat hammer to extrude a little more material toward the notch, then reshape it. The professional way would be to send it to a competent double gunsmith to tig weld it and reshape and reharden it and recut the hammer notch properly. The extravagant way would be to send it to Dewey Vicknair to make a new sear from scratch, except I dont think he is doing routine repairs anymore. Good luck with it.

It's not uncommon to see Parker locks on eBay. If you can find one of the same style and have a picture good enough to judge the condition, you may find a used lock to use for spare parts.

Finally taking some time to post an update. I worked on the sears with a set of stones I had for working on my 1911s if they needed it. I'm certian it was worked on before because it was not even/flat, which I think was part of the problem.

I unfortunately didn't test the trigger pull before working on it but the final result was a trigger pull of just over 4#.

I'm happy with that.

Perfect

That is some mighty fine work. You got skills.

Jim, did you use a Powers jig?

Mike, I did not. Just used a vice and eyeballed it. Took my time and checked it often with a magnifying glass.