From what I've seen, apart from area's around the front fork spindles, most all other grease nipples on a Vincent are useless. All those large cavity areas on the bike you would need to near empty a grease cartridge to fill it enough to get to what you want lubricated, and most all of these areas, you will end up with grease everywhere. It would take a game man with a grease gun to pump some into the brake cam boss and be fully confident that it was not going to end up all over the brake linings. I use grease on assembly and oil for servicing on most lube points on these bikes.