The easiest way to spot unbalanced tension is to look for visible knots or loops at the end of each stitch. When the bobbin thread shows on the right side, the needle tension is too tight or the bobbin thread, too loose, as shown at left in the illustration below.Click to see full answer. Also to know is, why are my stitches loose on my sewing machine?A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.Likewise, how do you adjust bobbin tension? To loosen the tension, turn to the left (counter-clockwise). To tighten the tension, turn to the right (clockwise). If you think of the screw like a face of a clock, you should be turning the screw no more than 10-15 minutes. Make a single adjustment at a time, place the bobbin back into the case and stitch. Beside this, what do I do if my bobbin thread is loose? If the thread doesn’t unwind at all, your tension is too tight and will need to be loosened. If the thread unwinds with no effort and the bobbin drops easily, your tension is too loose and you’ll need to tighten it. Use a tiny screwdriver and turn the screw on the side of the bobbin case by 1/4 turn.What tension should I use for stretch fabric?For loftier knits or stable knits, like ponte or scuba knit fabrics, try a lower tension around 2 or 3. Around 4 is usually good for heavyweight knits. The 4-5 Tension range generally yields the best results with light to medium weight knits. If you have to use a tension above 6, your machine probably needs servicing.