My first attempt at saddle stitching on a project made the value of a stitching pony immediately clear to me for that. They also seem to be pretty useful for softly clamping other small things on which one is working. Commercially-made stitching ponies are not particularly expensive or hard to find. I was thinking about the springiness of plywood and, how easy it might be to make something with a simple cam clamp. I gave it a try and, this worked out even better than I expected. I was actually a bit sloppy building this because I assumed it was going to be a prototype I threw away. It works great and, seems to be everything I need for now, though.