I found
a blog post on a converted 66. It's hard to tell if it was a treadle or a hand cran, but at least either of the two because of the spoked hand wheel. The motor and light setup is ideal for this model. The motor bracket goes on with out any bothersome issues as well as the correct size v-belt for the hand wheel. Machines who originally were sold as electric had a smaller size hand wheel, and some had this type of hand wheel fitted if converted. The spoked hand wheel works fine with the motor, I have the spoked hand wheel on my 201K and it's electric too.