Originally Posted by PaperPrincess
I'm not an electrician, but I would hesitate to using router (rheostat) on a sewing machine, especially if it's a computerized one,
I have no idea if this would be a problem - maybe there will be an electrician or someone who can answer this definitively.
Until then, maybe you're right and people shouldn't use this on a computerized machine. Thanks for the input.
I've used the router control primarily on model 15's - one with a vintage and one with a modern repro motors. I also used it with two vintage Kenmores. I first heard about it several years ago on a vintage machine list and I've never heard of anyone ever having any problem with it at all.