I have a 1953 15-125 and I've FMQ on it a few times. It has a large screw/knob on the underside which when turned will lower the dog feeds. (Love making ruffles with the old ruffler on this machine.) I also have a Brother and I like FMQ with it, too. But, the throat space is very limited on my Brother. Below is a picture of my little green Singer. Good luck and post pictures of your work if you do FMQ on your Singer.