Spring for treadle de-railer
I am looking for a new spring for the derailer (?) on my Singer treadle. I'm not sure that's what it's called, but it is the spring under the small loop in front of the fly wheel. Moving the loop to the right causes the belt to come off the fly wheel, and the spring returns the loop to the operating position. I hope this makes sense. Can someone please tell me the proper name of the spring and where I might be able to get one? TIA