I am wondering what you did with the feed dogs while you were FMQing. I have a 15-91 that i'm just setting up to try FMQ with it right now and don't see a way to drop the dogs. Did you just loosen the tension screw from the top, or did you cover up the feed dogs with something?
Thanks for the help - i'm super excited to try it for the first time. It's just gotten back from having its electrical checked out - i was afraid it might start a fire and haven't used it yet. It got a green light, so now i'm ready!