Just recently heard of a local 'Smith of renown active in the 70s-80s when the local PD was using mostly revolvers. He would fit parts and match springs and got everything near where he wanted them. Then he would pop off the side plate, fill the frame with toothpaste, and walked around the house for a weekend or two with the blaster in his hand, pulling the trigger a couple thousand times. Detail strip and clean, then return to coppers for cash and rave reviews.
I almost dismissed it as a faerie tale, but for the source, a cop of that Era, and how many people do the $0.25 trigger job with toothpaste, rather than metal polish (Flitz, Brasso, etc.).
I have two metal framed revolvers to try this with, but one is a SAA clone, and the other is an inherited 100+ year old Colt New Service in .41 LC, prolly less effective on on the first, and not willing to risk the second for spare parts reasons, so the payoff will be likely be lower.
Just putting it out there....
pat