I am going to make a set of 4 eccentric edge clamps to fit 3/4" round dog holes. I was thinking of going with a mostly round tear drop shape with the post off center to one side (actually both sides; a pair each way since every now and then the direction matters). Anyway, I wondered if there were any good rules of thumb. The math is easy; however far off center I am is half the amount it can adjust. But it seems likely there is a good ratio, like maybe a third of the radius or something, where they hold well but still have a reasonable adjustabl;e range without being too large.