It can be a little tricky to sew with a twin needle and get the seam to hold. So here is my best tip.
A sewing machine is a bit like an oven; they all work slightly differently, so you need to test what works best on your specific machine.
But generally, a twin seam is sewn with long straight stitches and high thread tension. On my household machine, I sew with a stitch length of 4 out of 4 and thread tension of 8 out of 9. The thread tension may need to be adjusted occasionally depending on the fabric you are sewing.
Do not backstitch when you sew with a twin needle. Instead, leave at least 1 dm (approx. 4 inches) of thread at the beginning and end of each seam. Then tie a double knot on the threads that are in the same track on the right side and the threads that are on the wrong side. Then pull the threads from the right side to the wrong side using a hand sewing needle. Then tie all the threads together with a double knot and trim the threads.
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