I only needed to move the wheels apart by 10 or 15 thousandths of an inch in order to fit the NMRA gauge, which wasn't enough to adversely affect centering on the axle. I guess I would say that this thing works well for fine adjustments, but it might not be as useful if the wheels are extremely out of gauge. In my case, some wheel flanges were picking the switch points and pinching at the frog -- but it did not require a large adjustment to correct the problem.
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