u/Jaymes_Squeak

Image 1 — Singer 403 tension stop washer
Image 2 — Singer 403 tension stop washer

Singer 403 tension stop washer

I've recently been cleaning and maintaining a singer 403 I got on marketplace since I've been having issues with it nesting the thread.

While disassembling the tension disc I found the stop washer has a flat dent instead of a curved one.

Is this what's probably causing the nesting and should I replace it?

u/Jaymes_Squeak — 5 days ago