Bobbin Trouble
I bought some plastic class 66 bobbins from sew classic and have been using them with no problem in my 328k. I finally bought a replacement bobbin winder for my 1931 Singer 66 and I've tried winding 2 bobbins. One end of the first bobbin snapped off while winding. The second one wound all the way and then I couldn't get it off the winder. My husband had to help and it turns out the bobbin cracked and warped. Is this winder winding them too tight (as it appears) or do I need to use metal bobbins? If the former how do I fix it?