Knocking noise machine is knocking [against something] and not making any stitches. I slowly turned the knob to try to see what's hitting, but to no avail. Thanks in advance for any response,
Sewing Machines - White Sewing - Speedylock 1600 Mechanical Sewing Machine
Answers & Comments
Too little info. but a common cause of knocking is the loopers hitting or rubbing each other, an out of time issue. unfortunately i would recommend that you take it to a qualified repair shop to avoid greater damage.