here is some important tips to sew inner tube with sewing machine, is just something I learned from do it :
1.put thread tension on higher number (on my sewing machine is 9);
2. put some vegetable oil (a thin thin layer) on the upper (and only on the upper) part of the inner tube you are going to sew to allowed a better running;
3.never pass to many time in the same spot with the needle or it will reap off, use simple stitch, or zigzag, never triple stitch.
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