This is a plain and simple 62 caliber muzzleloader without any fancy features except that it has a set trigger. I bought it out of state by mail from a so-called gunsmith, couldn't go back on him to pay for the changes that the rifle needed, and this rifle had problems from the beginning that needed to be fixed by a local gunsmith. It used to shoot okay. But now when I pull back on the hammer and slowly release, I can feel it slip past the set trigger position, and the hammer stops at some oddball half cocked position from which if I pull the main trigger hard, the hammer falls hard enough to fire a cap. But I dislike using this rifle with a malfunctioning lock. Unfortunately I don't know the style of the rifle. It has a 36 inch barrel and a half stock. Oddly, if I loosen the screw that holds on the lock so that the lock wiggles in place, I can actually fairly reliably fire it in that weird half cocked position. I've carefully deepened the locks mortise in case some wood is in the way. The breech plug clears the lock plate. Also I completely decreased the entire lock inside and out up and down, and back and forth. Then I cleaned it with aerosol brake cleaner to get everything off of it, scrubbing it with a toothbrush to get rid of any possible debris, so now the lock is totally dry. Two questions: does anybody have the faintest idea of what might be going on here, and two, what is the proper lube for all those little parts inside the lock that are under such high pressure and torque. I'm thinking wheel bearing Grease, but I'm sure I'll get catcalls for that. Oh, I'd include pictures of the lock and rifle using macro so you can see this stuff, but I just don't know how to do that with this phone. Thanks for any help guys.