Years ago Track sold a replacement spring set, main & frizzen, for that lock which were much better than the factory ones. I put them in mine and it was an improvement but they aren't available now. I was never impressed with the lock or the entire gun and I had done a fair amount of work to mine. The tumbler was a poor fit in the plate and I reamed it and bushed it with a piece of brass tubing. I'm sure I had done other work to the lock but after about 25+ years I don't remember. I can't help with the hammer throw as I bent mine. I didn't like the way it met the frizzen no matter what I did with the flint so I heated it and bent it down till the lower jaw pointed to the center of the pan. I tested it a few times and it seemed OK so I put a new flint in it, tried it once and put it away till the match in a few days. I was able to fire one shot and then the flint shattered on the next. It seems likely that the flint struck the frizzen more on the top of the flint so I believe I bent it too far. I never fired it again and I was fairly disappointed with it overall which was too bad as I had high hopes of it becoming my smoothbore match pistol. It did balance and point very well.