have you noted Phil's mud shield pieces you fit over the spindle
after tightening the mounting rings, add some more O rings
around the spindle, between the arm and the seal ring..
to seal even better around the shaft.

http://www.philwood.com/products/bbp...dcupguards.php


you could Bid on a WTB Grease Guard BB , they are not made anymore,
so that may have to be your source.

but a needle grease gun tip, will push fresh grease in and purge
out the old grease..

another discontinued one, SKF-Sachs, the bearing cartridge
with sealed bearings
was behind shaft packing in the cups, further shielding the bearing cartridge..