How important is the sleeve?

Just got a Shimano XT 760 crankset that came installed on the frame.
Unfortunately, the installer dicked up the plastic sleeve that runs between
through the BB shell between the two cups, crushing it toward one end and
cracking it, thereby negating whatever seal it was intended to provide.
Anyone know how important this sleeve is to the longevity of the bearings in
the cups? I can't find anyone selling the sleeve separately, so I'm
guessing it may not be all that significant.

Cal





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