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TBF I was never on board with your don't tighten it enough to not bind up method, you tighten it up properly and if it's binding up then something else is wrong. But glad you're OK.
snottyotter-
Definitely not my best idea, from now on even my shoelaces will be tightened to proper spec! Almost shit my pants when I realised what could have happened.
@Eseman thanks for the offer but me being in another country I think it'd be more trouble than it's worth! I've arranged to have it looked at by someone from a bike shop nearby who apparently really knows his bearings so hopefully I'll get to the bottom of this. Shimano UN seem to be sold out everywhere unfortunately so that means I won't be riding this frame for a while.
Zebra
I think I almost fucking died today because of this bottom bracket. The NDS was unscrewing itself and I didn't notice. I was coming down a hill and when I get to the bottom I jump off the bike to take in the view. Not two steps later, my cranks completely seize up. The left side of the BB had unscrewed so much that it pushed against the left crank and caused it to lock in place. If that had happen 10 seconds earlier while I was going down that hill I'm pretty sure I'd be dead now.
I'm certain it's because I didn't torque it enough on the left side but any more and the spindle would seize. I think I'm done with Miche at this point.