I've checked out the lock & trigger on my "new old" .36 caliber rifle. The lock mainspring is missing and I want to make a new replacement. The set(rear) trigger is missing as is the spring for it. I will try to make those missing parts also.
I have a couple of worn out saw blades for the spring material.Wish that gun was mine. I love making parts like that. I use O-1 tool steel a lot for parts like that. Have fun, it will feel great when you accomplish your goal and post the results.