I'm also intrigued by treadles. My winter project is converting an old (electric) Singer model 66 into a treadle. I'd picked up an old treadle model 27 that was completely beat up, but the treadle base was good. So this winter I plan to make a new top for the treadle base, and drop in the model 66. The one good thing I kept from the old model 27 was the big, heavy, 6" flywheel (like the one in the upper right of this picture; I've heard that heavy handwheels are preferred for treadles. The 27's hub was too long to fit on the 66, so I had a friend turn it down on his lathe - fits perfectly now.
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