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It would probably be better for you to just buy a new impeller instead of gluing that back and re-drilling it. Impellers aren't that expensive to begin with.
I also don't think it's a good idea to drill the magnet either as you have found out, it is very brittle and will break quite readily.
From my own experience the MJ400 and MJ600 magnets have perfect circular holes that are centered while the MJ900 and MJ1200 have somewhat oval holes instead. The holes maybe oval but they should still be centered so there really should not be any need for drilling IMO.
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