by the picture the spindle looks scored - if the scratches have worn it down to the point of the bearing not fully seating on the spindle the bearing will walk on the spindle and cause more wear. Usually the spindle is not damaged on MB due to the large amount of grease and also the bearing adjustment being precise rather than a fordchevy feel and lock. overtight bearings will burn the grease and cause the rollers to drag the inner race with it causing such scoring.

The shade tree way in oldschool times was to take a punch to the side of the spindle to deform it or a chisel to make some teeth to give the bearing some bite after dressing the spindle.

correct repair was to change the spindle.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)