I picked up a 301A from Craig's List several months ago. It is in good shape. It came with several feet and 3 old bobbins. I ordered a dozen more bobbins for 221/301. Last night I finally got it cleaned up and oiled, put in a new needle and tried to wind the new bobbins. But the bobbin winder doesn't spin when the new bobbin is in place. I loosened the screw and adjustment behind the bobbin winder and played with a number of minor changes to the setting to try to get it all lined up but it wouldn't go. So I pulled the old thread off one of the bobbins that came with the machine and it wound like a charm.
Does anyone have any suggestions? Anyone else have trouble with new bobbins but not the old ones? The bobbins look identical when compared.