I picked up a used SG 2000 (2006 model) recently and the large leather honing wheel has a two gouges that to me seem pretty substantial. They don't run the entire width of the wheel, but are deep and wide enough (2-3 mm) that there is no possibility of smoothing them out. I'm guessing maybe previous owner caught the edge of a blade accidentally at some point.
Is this a common or harmful situation?