Very impressed with the quality of this flashlight for the price! This seems very accurate, but I had to fiddle with the 3 adjustment screws to get the head to move smoothly and without "warping", but this is typical of any drill head using a cone/rod configuration. Runout doesn't matter since the tool has to work with a design offset, but still. The static top is very straight and I've only measured 0.0005 to 0.001 runout in 5 separate full installs/teardowns, so at least it fits! For the home