Dragoon,
You might want to take a good look at the hand & spring which is the most likely part to fail. I keep a few BOBBY PINS around in my parts box to replace the spring with. The hand is a tough part to fit so I have rarely replaced one. I have 3 or 4 Colts & Remingtons with bobby pin hand springs. I carefully remove the original springs (or fragment) which is staked in and replaced it with a facsimile patterned after the original shape from a similarly hand shaped portion of a bobby pin, reinserted it and re staked them in place. That way the hand needs no fitting. So far, none of my replacement springs has failed.
Another option is to have a fixed coil spring & plunger installed in the frame under the grips to push the hand forward. That is the best setup but it takes some tools & talent I do not have.