Yeah, I just krazy glue them too, if that happens. This one, I have no idea how it happened, but the magnet broke clear down the middle into two pieces. Two of the fins also snapped off in the melee. I daresay it's probably not worth salvaging at this point ...
Anyhow it's easy enough to order MO so I'm basically set anyhow. I did wind up wandering up to Pisces and they wanted $30 for the impeller so seeing as you can get the whole powerhead for about that I decided to just forget about finding an impeller locally. The good folks at Reefwerkz are sending me down one anyhow so it's a non-issue now.