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@790
Hi Rogan.
Sorry for the essay...
Along with DFP's shout it's worth noting that with cartridge bottom brackets you should assemble them by installing the plastic ring/cup first. Then the main metal unit from the other side.
Also it's not always the case that the plastic ring goes on the left non-drive side. Some BBs have it the other way.
So dissassemble the BB check which way it should be orientated - there should a label - and then try again by placing the plastic ring in fully first in whichever side it should be.
Finally not to patronise but to be thorough remember that left non drive side is the normal righty tighty / lefty loosy deal, but the drive side is the opposite and tightens anti - clockwise.
If it is genuinely too long and for a biger BB shell you can always cut it down with a pipe cutter but remember to go back and forth along a single turn (360 deg) of the thread not round and round chasing it along or cutting straight across the plastic threads.