Try using a short piece of a paint stick about 1.5 to 2" long. I usually start with 800 grit then work my way up to 1500 or 2000 grit.With the little block hold it level trying to sand the high spots in the sag down keeping it wet and free of dirt.It takes a while.I usually try to get the run out with 800 to 1000 grit ang use finer paper to remove scratches then polish.
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