Originally Posted by virtualbernie
Originally Posted by Noiseynana
What kind of bobbin do you use?
You have a model 66 singer, made 11/3/1920. You should use a class 66 bobbin.
P.S. Your needle should be threaded from left to right.
How did you find the model number from the serial number? I was looking at machines today on e-Bay and went to the Singer site and could only find out when they were made but not the model.