Welcome from South Louisiana. We'll help when we can. I don't have one of the Singer 15-91 but will get one if one comes my way. Which reminds me, I have a Singer that I have to look up to see what it is and when it was manufactured. For sewing stuff, I post my questions here, but I, also, go to YouTube. It's unbelievable how much info is out there. Happy sewing and quilting!