I don't know much, but it seems to me there are a number of different pump-style guns. I guess some fit the nipples we're talking about, and others maybe don't. I've seen some online which are old, pump-style, but the end which the grease comes out of doesn't look like the one on the photo which Bess posted. As I say, if someone knew a certain gun does fit the brake grease nipples, eg on my 1965 B40F (apologies, I know this is the twins section of the forum, but there has been a duplication in that the matter has been discussed on the singles section as well) and was able to give the serial number of it (should be stamped on the gun?) then it might be possible to buy with confidence, either at an autojumble or online.
Anybody?
Phil.