I'm thinking about a custom crank configuration. Main reasons are orthopedic, but there are a few trick things I might try while I am at it.
I seem to recall seeing some cranks that were welded more or less like a dog bone stem (end tubes parallel). Possibly German custom, though all I could see in that vein at the moment are cast. Anyone see something like that?
My main concern is avoiding the need to machine the square tapers, or whatever interface. Seems one could hack off a steel socket from a donor, then I could mount it on a spindle in a lathe, and machine it round, and then fit it to a tube, and weld that to a 4130 crank arm.
I only need a single ring up front, I will have an IGH in the rear.
Anyone seen anything like this? What thickness of 4130 for the arms. It will be for touring. I'd be willing to take a hit on the weight to get a solid set-up.