I need some help diagnosing a problem with my 15 91. Sometimes the upper thread gets hung on something in the bobbin area and makes a nest on the bottom. It only happens every 6 to 8 inches. It doesn't hang up, just makes a noise and keeps sewing. Anyone else have this problem? I'm thinking of ordering a new bobbin case from Sew Classic.
I've watched it in motion. The thread goes down and around but the loop hangs up, then the next stitch brings the whole mess up to the fabric and the machine just keeps stitching. Can't find any burrs or scratches that would explain the thread getting caught down there.
Does anyone know what Singer needles size 16 X 231 Y fit? There are a couple of dozen of them. Also have Groz-Beckert B 27s, also labeled DC X 27. No clue what they go to.
Last edited by redmadder; 05-21-2014 at 03:46 PM.