G'day folks,
For this application, the Penrite 00 grade semi-fluid grease is the way to go.
Not that other makers' 00 grade EP greases are any less suitable, just that the minimum pack size is 2.5kg for other brands.
Castrol Spheerol HTB2 is totally unsuited to use in gearboxes; it's a non-melting formulation, intended for tapered roller bearings that are subjected to high temperatures, e.g. wheel bearings of cars with disc brakes.
I use a round-ended flat spatula to pack grease into this sort of unit, as it's easier to wipe clean than an old spoon would be.
It's just a ~150mm long piece of old power hacksaw blade, with the teeth ground off and one end ground to a rounded profile. The other end is ground straight across, for use as a gasket scraper. If you get a 450g grease cartridge, use a spatula that will fit into the cartridge.
