over tightening is a cause of this but if the bike was ridden hard offroad that is the bigger cause (IMHO). if the HS is a good shape otherwise and you are keeping the bike I would put new loose balls in it. that will change the spacing and keep them out of the dimples.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk