My Singer 500 is having problems
I've been sewing on this 500 for 50 yrs and it has not failed me. BUT now there is a problem that I can't seem to figure out. I'll be sewing along and then it will just stop and knot up underneath. the thread is catching on something, put I can't figure out what it could be. It's pulling the top thread down. I'm hoping someone on this great board can give me some ideas as to what it could be........