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My last three guns have had the annoying issue of the plunger leaking by the grease. You can't get any more to pump out, but you can't retract the plunger either. All the grease is behind the plunger seal.

I remember my dad buying grease in 5-gallon buckets years ago, filling his grease gun, and it just WORKING. Nowadays, with the cartridges, I have trouble with the grease seeping past the plunger, and/or air-locking. I have begun to retract the plunger just off the grease when done, and that has...