Originally Posted by
leonf
i just thought I'd post a couple pictures to show how a 201 potted motor actually spun the main shaft. I am supposing a 15-91 and the green variant is very similar.
When I see the potted motor sold from ebay, the seller claims that the motor with drive can be used on both the 201 and 15-91. However you need to be aware, that the bobbin winders are different, because different bobbins are used.