i would be carefull of the bit stuck in the head vibration over time and heat may dislodge it and trash the bore again. As for the cases should be able to clean them up ok as the surfaces are not as important apart form where bearing sit and any other smooth polished surface.
Happy to have a look at them if you want can bring them in to my workshop in newmarket after work one night (or during the day boss can stop when he likes) if you want. Im normally here till 6:30ish in fact im still here now.
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