^^^^
That is what I did on my grease gun.
I have two 12" flexible hoses coupled together... on the end is which a grease coupler that I ground a 'flat' on two sides (180° apart). It now easily fits into the yoke section of driveshafts.
The length of my hoses allows me leave the grease gun on the ground (if I wish), but more often than not....I just hold the coupler on the zerk fitting with one hand (to ensure it will not come off) and operate the grease gun with the other. Always use a pistol grip type grease gun. If you have a lever type gun....throw it in the trash or give it to someone you don't like.
I have a pneumatic operated gun...for larger projects (tractors and such) but I don't ever use it on the vehicles.
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