Originally Posted by purplefiend
Abby,
Are you using new bobbins? I was having problems with the bobbins I bought at Joann's, some of the bobbins were
not made quite right. I found that original vintage bobbins seemed to work just fine in my Singer 201k treadle.
Sharon W.
Sharon makes a great point here, in the older machines you need to use the metal bobbins and sometimes they are not quite up to snuff. I think I have found 5 or 6 of the class 15 bobbins that were not right and had to toss them so when you are dealing in aftermarket items you can run across this.
But rule of thumb is metal bobbins in vintage older machine and the plastic in the newer machines.
Billy