HELP - I have a lovely 15-91. Just gave her a good cleaning (inside and out per Billy's tute) and she sews like a charm. HOWEVER, the minute that I loosen the thumb screw to lower the feed dogs....no more sewing! She makes a feeble attempt and catches about every 10th stitch, but I cannot do FMQ at all! I have the FMQ foot on, the presser foot is lowered, I'm holding the fabric tight and low...... The minute I raise the feed dogs up, she sews fine again.
Any hints?
Thanks,
Linda