Bobbin winder o ring

[Flatbrimmer]

Any one have any leads on a O ring for a Ferdinand Bull bobbin winder ? And or threading sequence.? Thanks

[AEBL]

If the O-ring looks like your usual O-ring (i.e., like a tiny donut), you could go to Harbor Freight and get one of their O-ring packs and see if any of them are close enough. Other than that, you could find a machinist supply company near you and see if they had something there that would fit - just bring the old O-ring with you.