I've been told that the 15-125 is the same machine as the 15-91. I did download a free manual for the 15-91 and it looks the same as the manual that came with the 15-125 And although, I don't know much about it, I think it has a potted motor. Is that where the motor is attached to the outside in the back? At least that's where the motor is on my new (old) machine. I cleaned it up yesterday and I put new thread on the bobbin and threaded the top. It sews a beautiful straight stitch. Can't tell the bottom thread from the top. Today I'm going to a different town to a fabric store that has a repair shop. I'd like to get it really cleaned, greased & serviced before I start using it. Also, I need to find a darning foot so I can start to practice my FMQ. This has been so much fun. Wish I had a bigger house...I'd really start a collection of vintage machines...hahaha.