Originally Posted by
relyt
I have had good luck with the dry graphite lube for the same problem. Mine is a powder and came in a little tube.
I strongly warn against using graphite in a bike lock. I managed to immobilize my locking mechanism completely with graphite and had to pour large amounts of light oil to get rid of it and get the lock operating again. Boeshield, on the other hand, works wells providing both lubrication and a level of protection against water.