I spent some quality time with the Junkyard Dog tonight - mostly cleaning but I learned something very important that I'm going to have to review on all my other work and everything I do going forward. More on that in a moment....
The majority of the time was spent with a piece of white scotchbrite and WD-40 just cleaning the accumulated mung and light rust off of the frame. The scotchbrite pad was clean when I started....
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I also did some experimenting with the barrel to see what would happen if I cleaned it with the white scotchbrite/WD-40 combo, then did a WD-40 lubricated power burnish on it using a carding wheel. I only worked on the first two inches from the muzzle on the left side of the barrel so that I would have a before and after. Here's how the burnished nickle compares to burnished stainless steel on a different gun:
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I think that's close enough. I'm going to strip the frame down and do a thorough cleaning on it with the white scotchbrite and WD-40, then run the barrel through 6 or 7 grades of scotchbrite to smooth it out, then burnish the entire thing.
If that doesn't work out, the backup plan is a soft rag, a can of Mother's polish, and a movie....by the end of the movie the whole thing will be a mirror.
It was when I was putting the gun back together for storage that I learned "the big thing". When reassembling a gun, I've always put the thumbpiece back onto the bolt right after I install the bolt and before installing the hammer. The sideplate is always off and the yoke/cylinder are sitting on the bench - which means the bolt is in the forward position. The thumbpiece always just drops right on...
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Tonight, I had the cylinder in place and closed when I went to put the thumbpiece on, which meant the bolt was in the rear position. And the thumbpiece didn't fit.
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This meant that the thumbpiece has been holding the bolt slightly forward and applying extra pressure on the center pin.
But does that make a difference? By my scale, it makes about 10 ounces of difference in the double action pull. I measured the double action pull on the Dog by resting the butt on the bench and cycling the trigger through the double action pull 6 times without resetting the gauge. The final result is the highest pull weight going all the way around.
Without the thumbpiece installed:
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With the thumbpiece installed and the bolt dragging on the center pin:
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And this is how the list of things to do during a trigger job gets longer.....