Drill powered grease gun - GIF

Drill powered grease gun.

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Previously:

5-gallon bucket grease dispenser - GIF
Filling buckets with grease - GIFs
Grease applicator - GIF
Grease dropping points compared - GIF
Grease gun refilling plate - GIF
Heat-resistant grease - GIF

I don't see the advantage for the examples they show, they pump extra grease out of the joint, in excess of what is needed. They are just wasting grease...

Also, why are they running it with the spring stem still fully locked in the load position...

No air compressor needed.