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The 15-91 is what I most commonly see here in the NYC area. The potted motor is easy to spot if you're lucky enough to see non-operator-side photos of the machine: more
. the absence of a side-mounted motor peeking out here (and the simple decals on the arm meaning it's a modern 15) pretty much guarantees it's a 15-91, with the potted motor just hiding from the photographer.
(The 201 is the only other machine you'll see with this circular plate. We'll get into that later.) more
If it is a model 15, we'll next figure out if it's a 15-91 with the potted (direct-drive) motor, a 15-90 with the side-mounted (belt-drive) motor, or an earlier model 15 that might have been treadled, hand-cranked or converted to electric.
Here are the most common causes of skipped stitches and how to solve them. [links]
If you are using specialty thread and have skipped stitches, it doesn't necessarily mean your machine can't use it, but it can be a challenge. here
This problem should not be ignored because it weakens the integrity and strength of your sewing. At the very least, repair the problem and re-sew directly over the unreliable sewing or remove the entire line of sewing and start again. here
One of the most common sewing machine problems is skipping stitches. It can be one skipped stitch or multiple skipped stitches between normally sewn stitches. The machine may even sew perfectly normal and then suddenly skip a few stitches and resume perfect stitching. Most sewing machine problems can be resolved by re-threading the sewing machine, but skipped sewing machine stitches is a different story. here
2. I started using a felt disc under my spool to add traction, this helps prevent the spool from continuing to turn after I've stopped stitching (especially if I've been sewing "full speed"). https://www.sewingpartsonline.com/fe. d-3mm-4pk.aspx [links]
1. When I change the stitch direction (forward vs reverse and vice a versa): if I don't stop the machine completely before switching directions it sometimes causes the thread to backlash around the spindle. here
I don't have that particular model, but I do have several vintage Singers, and have encountered that problem before. I have found three things that can cause the thread to spin around the spindle. here
3. I also get that backlash if the spool is taller than the spindle. I noticed the spool of thread would be rocking on the spindle, and eventually it would climb the spindle and jump off completely. When my spool is taller than the spindle, I push a plastic straw onto the spindle to help keep the spool in place. here