I sent Gunsquirrel a 1917 hammer complete with DA fly. He tried it and informed me that it would not fit on the hammer stud, which was kind of surprising as the hammer I sent was one that used the same early hammer block system that is mounted in the side plate.
Anyway he sold it to me at a very reasonable price. Upon receiving it I took the side plate off and removed the hammer. Interestingly the main spring had a extra piece of flat spring in front of it and the strain screw was not tight. Some kind of odd main spring mod, that I will not be using.
Anyway, I used my small set of pin gauges to determine the Bubba hammer had a .126 hole and all the 1917 era hammers I have, had .121 to .122 holes. The threaded in hammer stud looks stock, but who knows. Anyway a 1/8" (.125) chucking reamer and a bit of careful polishing with a small round extra fine diamond file and the 1917 hammer went on the stud.
Next was the fact that the King hammer had no DA fly making the gun a SA only. I tried several DA flies on the 1917 hammer before finding one that was close. A tiny bit of work on the tip and the top ledge that adjust how far out it goes and it worked fine when the trigger completely reset, which it didn't do consistently. The reason for that was the rebound spring had been shorted considerably. In fact, when I removed the slide, the spring only came flush with the end of the slide. I installed one that was a couple coils longer and away it went. The trigger resetting and the DA working every time. SA pull is decent. There is still a real small hitch about 1/2 way through the DA pull, which tells me the fly is binding a bit as it completes its hand off to the trigger. A tiny pit of polishing on the DA fly surface should fix that.
Then it will be off to the range to see what the story on the main spring is. I will take screw driver and a couple factory main springs along.
I think that after a bunch of tinkering I now have a nice pretty nice Outdoorsman. My first S&W with the early 2 screw adjustable sights