Originally Posted by
miriam
Why would a machine make a perfect stitch then when you run it in reverse the bobbin thread comes way up loose - loopy bald heads..... only in reverse...
Is there any chance that when the fabric starts to feed backward, it pulls the bobbin thread a little differently under the spring where there's a little less tension? It's the only thing I can come up with, and it's a long shot. I'm assuming you cleaned the thread path on the bobbin case. Spring's not damaged at all?