Thanks, everyone, for all the good advice. The screw for the snap on foot attachment came out quite easily with the screwdriver, so I'm pretty sure I can do this now. And I have found what appears to be a more durable short shank free motion foot for half what I paid for the Pfaff accessory foot. When my retirement check gets here on the first I will be ordering it. Unfortunately I had to buy the expensive foot today to finish 3 feet of border fmq. But this project has been a WIP for a year, and it is now ready for the binding. Yea!!!