Some compasses are easier to use than others. The better ones don't slip their settings while in use. They are somewhat more expensive. Also, if you select a surface for backing up the paper that isn't too hard, like a cork, cardboard, or soft plastic mat, the center spike won't be so apt to slip. I saw an interesting variation on the drawing compass in an art supply store the other day. Its basically a flat, round piece of plastic. It has a small hole for the center of the circle and several small holes in a row for making circles of different sizes. You take two well sharpened pencils, put the point of one in the center hole, and the other in one of the other holes. Hold the center pencil still and run the other pencil around it. This *does* require using both hands at once, but since one only has to stay still, maybe this wouldn't be a problem? Best of Luck. Ross