I recently posted here
Bobbin case for 306K about a 306K that was gifted to my granddaughter. She lost the bobbin case, so I am helping her get the machine where she can use it. I purchased the correct size needles and bobbin case #105032. The bobbins that came with the machine (they look like the class 66 bobbins that I have) did not work in the bobbin area, so I purchased #55623S L type bobbins. They work fine in the bobbin area, and will fit on the shaft to wind the bobbin. However, the finger that fits down into the bobbin when winding is so tight that the winder will not turn. Any other options on bobbins? I am at a loss to know what to do next, unless she winds her bobbins on another machine?
P.S. I have a parts list for 306W and it calls for a 55623 bobbin.