Successfully greased one zerk fitting. The gun would NOT disengage from it. I pulled at it, yanked at it, moved it around a little and yanked some more. I tried prying gently, but just was not comfortable that that much force should be necessary. So I moved the grease gun from side to side, a little bit at a time, to see if I could get it off by pulling at an angle. Just a little at a time, you know, very gently. After a few tries, it felt like it was coming loose.
It came loose, alright! I've broken off the tip of the zerk fitting, which I still cannot remove from the grease gun, by the way. So I wonder how you remove the REST of the zerk fitting from the engine component, with nothing to grab onto. There's just a tiny little spring sticking out of it. Any wisdom? Hopefully I don't have to spend every penny I save changing my own oil fixing this.