I'll be honest in that I can't quite figure out how this works. I did note the acentric gear at end which would be very difficult to balance and would surely pu

I'll be honest in that I can't quite figure out how this works. I did note the acentric gear at end which would be very difficult to balance and would surely put huge loads on the shaft holding it. From the text it sounds like the ratio is selected by spinning the lower shaft at a variable speed, which is quite interesting but sounds like a bit of a challenge.