I have a dialback & it is a very fun toy to play with but after marking my dampener at different points using pieces of wire measured w micrometers the dial back is pretty much a degree off anywhere and it would have to be as it is using a time delay & different makes of balancers are different diameters so if the dialback is calibrated for a chebby sized dampener the delay wont be correct for us. It may be an insignificant amount but I have remeasured meticulouly & my Sears dialback is not dead on accurate (but I love using it)