That machine is identical to my treadle in every way except the motor. Just find an o ring at a machine shop/supply place ( ask the guys or farmers in your life,lol). If you can take off the old one as a sample ( it'll likely break) that might help.Buy a few sizes to experiment ( not expensive) & you'll find one slips on snug & won't spin in use. There are sites on line for antique Singer parts, but likely more expensive. This would use those steel solid bobbins most treadles use...easy to find at thrift shops etc.
Last edited by stitch678; 11-06-2016 at 04:49 AM.