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@snottyotter @aniki Thanks for the responses, this is a bb I have had in the frame for a while (so pretty sure right shell, spindle etc). bb shell is faced on the ds and then the nds cup doesn't have a lip so i assume facing isn't important there - do you mean checking if the threading is parallel either side? Job for a shop?
I took it out as I wanted to denitrol the inside of the frame and when I put it back it started binding. The daft thing is I can't remember if this is something that happened first time round and I just backed it off until it span freely, then subsequently forgot. Might try the campag route and locktite it in. Haven't died yet but it just seems like a pants solution.
nejib
snottyotter
The cups have opposing thread directions to ensure they tighten during use rather than loosen. So you may end up with it torquing itself, especially with binding bearings. I would also see if you could have the BB shell chased and faced. Cruddy threads or out of parallel shell faces could cause the cups to go out of alignment at higher torque. But a UN55 might be cheaper.