Hi - has anyone out there had any experience of relubing the "sealed" BB bearings on a HTII Ultegra crank? I used to regrease the cartridge bearings on my skateboard by simply lifting the neoprene cover, clean, re-grease and pop back the seal. Can you do this on the Shimano ones? Not working so can't really afford to buy new BB bearings.

Cheers folks.