I treadle a Singer Fashion Mate 237, it uses a class 15 metal bobbin. It has reverse, does zig zag and straight stitch, its good for FMQ too. You don't have to change the hand wheel to treadle it; just remove the motor and light.
https://www.flickr.com/photos/391684...7650482954470/
https://www.flickr.com/photos/391684...7650482954470/
Sharon in Texas