Stripped it down to take a peekaboo, inspect gun & refresh my frazzled excuse for a memory. Going to be hard to describe.
The safety detent plunger seems to work marginally at best. Without hammer cocked, with safety on, double action pull moves hammer back almost to 1/2 cock position, no farther, cannot get to, or past 1/2 cock. With hammer cocked, safety on, trigger pull does nothing to fire gun regardless of force, short of breaking trigger parts.
When gun was brand new, no work done at all, safety had a very light touch to engage/disengage, not a strong detent as I'd expected, was somewhat concerned by that. I'd guess it took 4-4.5 lbs force to engage/disengage, no real solid 'click' of the detent when moving safety on/off. With work done the safety engages roughly the same, but disengage is lighter. Without hammer cocked it requires maybe 3-3.5 lbs force to disengage safety. With hammer cocked it only requires about 3 lbs force or less to disengage safety, that bothers me!
Have to say, the gun is now unsafe to carry 'cocked & locked'. I don't carry that way, as I lower hammer from full cock to half cock or all the way lowered and engage safety for carry.
First I'll try to see if I can cause safety detent plunger to have a stronger engagement. There appears to be a little groove in safety shaft for detent to engage, but it misses it. Possibly it always did, can't say for sure. First I'll try to remedy that, maybe see if enough material is there to cut a new groove, but I doubt there is. If that can't be done effectively then it looks like a new safety is required here.
Thanks for assistance, any further advice or comment welcome of course.