This afternoon I went out in the garage and mocked up a yarn swift. It definately shows that I didn't bother to find a measuring stick and instead used the Mark I eyeball. Also my lack of a drill press shows. However I suspect it will work. and I got the important holes really square (the ones that contain the axle). Also the finish on it is distinctly um.. workmanlike. yeah that's a nice way of saying I built it out of scrap I had in the garage. The only new purchase for it was the dowels, for the arms. Maybe I'll get a picture of that up too.