How to mend Singer 57820 C

the thread is bunching on underside of fabric it looks like birdnest?

Bobbin won't wind?

singer HD110?

Machine Stuck in Reverse?

1965 Singer 275k sewing machine foot pedal?

Singer 6234 Tension problems?

What size needles can I use for my Singer 39a3?

Singer 507?

how to get the tension right on my machine?

machine motor running the wrong way?

Why does a sewing machine motor overheat?

foot pedal 619490-001 CR505?

Hello zigzag industrial singer 457 u105 not stylist is missing stitches?

Presser foot is loose?

Singer 188K1 presser bar stuck?

singer foot pedal ?

I'm in Australia and need a Bobbin case for a singer 196K205?

where can I get a thread guide post for a Singer Touchtronic?

Why won't my Singer Touch Tronic pick up the bobbin thread? ?

Replacing a gear in Singer Stylist 457?

obtain?

Engine revving up ?

My bobbin case for Singer 2662 will not seat right and I cannot sew?

Singer zigzag 457 Stylist not threading bobbin/making stitch?

Need a service manual for a Singer Treadle Sewing Machine Model 66-1?

My CG 500/550 Singer Sewing Machine's bobbin isn't working?

pedal machine Singer serie K10736204?

How can I replace the Top Vertical Shaft Bevel Gear for SINGER MODEL 248?

Singer 201 went bang , smelt and now won’t work?

Singer model 750 Golden touch and sew?