I have 5 Parker Hammer guns, never had to work on the locks other than to clean. They are more delicate than locks I have worked on and spares not easily obtained.
I have worked on a number of exposed hammer locks. Trapdoor Springfield's and US Muskets used in competition mostly. It's common and fairly easy to adjust trigger pulls by lighting the sear spring. When I do it I always have a spare or two, it's a trial and error job . Some will lighten the main spring. Usually a mistake but some locks need it, problem is getting misfires if too light. Altering the sear - hammer engagement is often seen and I think always a mistake for the home mechanic. Not many have the ability to improve on the factory set up. If it has not been "worked on" it's probably correct if it has been filed it needs work for sure.
My bet is somebody lightened the sear and hammer springs years ago. Unless you have spares to try better send it off to somebody competent.
William
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