I have a Bernette 66 sewing machine that I'm still becoming familiar with. Whenever I start sewing, the bobbin seems to catch and sputter a bit, leaving a mess of thread on the back of the fabric. I'm certain I have the bobbin threaded properly-- I'm following the manual and there is tension in the bobbin. If I start sewing slowly, even just turning the handwheel, I don't have this problem. Any ideas would be much appreciated!
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