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One more update - I brushed the drive wheels, valve gear and side-rods with that blackening stuff (forgot the name) that Max made available a couple of years ago.
Neolube!
Well I spent a couple of hours with the diamond files - that's REALLY slow going.Then I hit on a faster method (figures - after I spent 2 hours with the files). It uses a sharpening stone that I bought from the hardware store - not a fancy natural one, just a $10 manufactured stone. It has a course side and a fine(r) side.Take the motor OUT of the engine so it is free rolling, and take off trucks, leaving only the drivers. Now, put the stone flat on the workbench, hold the chassis so it is standing on the stone at about a 30-degree skew (upright, but not rolling straight), and scrub it across the stone. [ edit ] Do NOT press down hard on the engine - you still need this to be a gentle process. [ /edit ] If you do it right, the wheels will turn as the chassis scrubs across the stone. This is important as it avoids flat spots. I then turn the engine to skew the other direction and repeat - trying to even out the the wear. I alternated every couple of minutes until the flanges were shallow enough.