What causes loose bobbin stitches?
– The bobbin thread could be wound incorrectly. – Check the bobbin was inserted properly. – Make sure that you are using a bobbin designed for this machine. – Make sure that the bobbin was threaded properly in the shuttle race.
You should see a small screw on the flat/closed side of the bobbin case. Turning the screw a tiny bit counterclockwise will loosen the bobbin tension; turning it clockwise will tighten the tension.
Why is my sewing machine making loops underneath?
Looped stitches are usually caused by improper tension. … Looping of stitches is sometimes caused by placing the bobbin in the bobbin case the wrong way. Check your machine’s manual for directions on inserting the bobbin. There may be lint, dirt, or thread between tension discs.