Originally Posted by
nanna-up-north
I would think that you would only want a 15-91 for FMQ because it's the only one that I know of that you can drop the feed dogs. I don't think you can drop them on a 201.
For a machine on a frame, if you had a machine you liked, but it didn't drop the dogs, just remove the dogs. Lots of people do this, and it's usually just 1 or 2 screws.
I agree with Candace though, I wouldn't want to change the bobbins under the sandwich on a horizontal bobbin machine.