Oh, wow. I think I might have made a big mistake
I did a post a while back called 6233 feed dogs not high enough. I think it was user error. I think I had a high shank foot instead of a slant shank foot. I can't go back and figure it out, because I parted it out. Oh, well, you learn something new every day. Or something like that.
As I remember it, I used the foot that was on it when I bought it at goodwill, but it still could have been the wrong one.