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I'm back down in the bat cave now
Chris--The single shaft will go all the way across. The two cylinders will be 90 degrees out of phase to make the engine self starting. I think I will be able to put the right side and left side levers 90 degrees out of phase on the single shaft and have it work. i'm not 100% sure on that yet.
Brian you could mill the spokes out of a disc of 3/16" plate, add a hub and rim much like you do with flywheels, it's just rotary table work.