The Illustrated parts list on the PGCA website is from a pre 1910 hammerless. After about 1910 quite a few of the parts were changed, including the sear springs, top lever springs, etc. The parts illustration on Numrich appears to have parts from both pre and post 1910 hammerless guns but it is hard to see and read. There are a few articles from Gun Digest that show the parts and disassembly of a Trojan, I believe, which will be post-1910. Quite a few gunsmith type people make replacement parts. Best bet is to ask on the Parker forum. Good luck.
