Howdy Hawkeye,
I think some work on the trigger sear and/or full cock notch on the hammer can probably fix it, but I'll leave that to the gunsmiths. However, I'd like to be clear about the type/make of gun you have. You did say it was a Richards-Mason (rear sight is a notch in the hammer & hammer-mounted firing pin) which would make it an Uberti with parts available, but since you said it was sold by Traditions I wonder if it might be a Richards conversion (rear sight on conversion ring and firing pin in conversion ring). If it is the latter then it is an Armi-San-Marco and parts are not available so you would need to be very careful.
Good luck.