The lower row of holes in the chassis is for the 3 axles, the upper holes are for the various gear setups. Haven't decided how to do the gearing yet, so keeping my options open by soldering all the axle bearings. The holes are countersunk on the inside of each frame to hold the bearings comfortably.
outside (above) and inside view (below)Hmm, a bit generous with the solder. I don't think this will be visible on the finished article, but decide to clean up the sides with a file anyway.
Cleaned the holes with a cutting broach, so the rods turn smoothly in all six positions.
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