thread is twisting
Hi, I got a Singer 401 and it has a great stitch. But after sewing on it for awhile, I notice that the thread was twisting and jamming up the thread..So I turned the tension dial, will it turns but the tension doesn't change. It's very tight when sewing. So I cleaned it, but still it won't loosen up. I've never taken a tension dial apart. The funny thing is, it sews a great stitch!!!! What should I do??!?!?