I'm having ongoing problems with my sewing machine. It's an elderly Singer 401A, but is in pretty good nick. It's just been in to be fixed, which fixed one problem(where it whirred for anything up to 10 seconds before beginning to sew) improved the other...for a week. The other problem is that the thread that feeds from the top of the machine is snarling and loose underneath the fabric. I was told it was a tention problem and that there'd been some thread wound around the tension mechanism, which my repair guy removed and then recalibrated the mechanism. This more-or-less(still tiny bit loose in places but huge improvement) fixed the problem...flash forward to a week later. I sit down to to the final hem on my a-line skirt, and it's worse than ever! I'm posting a sample of the problem on a left-over scrap. It's the underside of the fabric. Does anyone know what else I can do? I've already threaded, rethreaded, adjusted the tension knob, put a new needle in and tried a different bobbin.
Thanks for any help, this is driving me up the wall!