The bushings in the hammer and trigger are there to keep them centered in the frame. I think they are made of hardened steel, not sure about that, maybe bronze. This action is similar to a Colt Python action, in that it only has the single hammer to trigger interface rather than the later 2 step action of the current models. The 2 step was patented in 1909 and implemented at some point after that. The Python action hasn't changed in that regard to this day.
The headspace and cylinder gap can both be dealt with at the same time by putting the shims under the extractor instead of between the yoke and cylinder. This effectively "stretches" the cylinder to fill up the extra space. This is not a historically approved gunsmithing technique, but rather more of a field fix I came up with for times when it's not desired to do a barrel setback. It does work, however. On older guns, you have to cut the shims to clear the extractor alignment pins. On modern guns, there are no pins. The shims are easily cut with small scissors.
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