So I picked up this HR21. Seems to work pretty well, but I cant get the "3- Speed" shifter to do much of anything. I bought it from a sweet little old lady who said she always found that Speed-1 was more than fast enough for her, so she never used the other speeds. In my first use, seemed too slow for me, but speed control very stubborn to move- not surprising considering that it had not been used in a couple decades. So I lubed the cable, still really stiff and not "shifting". Then removed the drive belt cover to see generally what was up at the business end of it. Got the cable action loosened up enough now that it seems to do all it was ever meant to do, but surprised to find that all the speed control does is to adjust tension on the drive belt. Wondering: how could tightening the belt affect speed, unless the theory is to allow the belt to slip in the lower speeds so that it’s basically just getting less traction on the pulleys? Could that be? Am I missing something?
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