Hi Nick - whilst I bow to Kevin's far superior experience, I've never heard of the spoon-shaped thingy to insert grease with. That'll be because I've never known there was one because I read the manual! Here's what it says on P.54 of the D2-55 Manual (french version that is, presumably scottish version is the same). The text is accompanied by a couple of illustrations showing a hand pushing the nozzle of the little grease tube* into the joint between propshaft and rubber stern gland - yes, same place the drops of water appear when purging). Pretty rudimentary/haphazard, but as Kevin says it doesn't need much grease, and that suffices.
"Joint de l’arbre d’hélice.
Si le bateau est équipé d’un arbre Volvo Penta, le joint de l’arbre doit être purgé et lubrifié immédiatement après le lancement. Purgez la bague en la comprimant, tout en appuyant sur l’arbre jusqu’à l’apparition d’eau. Insérez ensuite environ 1 cm3 de graisse hydrofuge dans le joint.
IMPORTANT ! Le joint doit être remplacé toutes les 500 heures de service ou tous les cinq ans."
(paraphrasing - "Stern Gland. If you've got the Volvo Penta one, you need to bleed it of air and grease it immediately after launching. Squeeze the gland (ie to deform the seal between shaft and gland) until a few drops of water appear. Then insert 1cm3 (yeah right....) of waterproof grease..."
So, all this time I've done just that - shoved the nozzle of the (very small) Volvo-branded tube of grease into the gap and squeezed 'a bit'. My shaft doesn't heat and doesn't leak 10 yrs later.
Note that to cover themselves, Volvo say above you should replace the gland every 500hrs/5yrs (a bit like Alubat covering themselves in their 'Bible' by saying you should take the hull back to bare metal every 10 yrs and repaint....y-e-s...)
OVNI 385 No.84 (2004) - Sud Bretagne
ex OVNI 30 (1989)