Subject: Re: Those grease nipples?
Strangely the V12 has these, for lubricating the fan bearings; a bit old fashioned for the late 30s one would think...but then perhaps Lagondas had a lot in stock and were looking to divest themselves.
Your best bet really is autojumbles, that's where I got mine. Take a nipple with you, then you can be sure you're buying a greasegun with the correct fitting. From memory, autojumblers are awash with greaseguns, so you're likely to buy a good quality one for very little.
Laurence