50 years of sewing, and leather working, embroidery machine
owner, operator, mechanic and digitizer. Clicker die maker
and operator. Sewing machine mechanic, volunteer sewing
machine service on domestic machines at Colorado location.
I own 40 machines
I just finishing working on my Singer 44 (9" version of 31-15) had same problem. There was a burr on throat plate and needle was not adjusted on the scarf. Now if I can get it under the foot it will sew it.