important batt op Igrease gun tip

I love my bat op grease gun I bought from harbor freight. works great & so much better than the old pistol grip pump. what I just learned was last week I hit the trigger & grease came out, so I thought I was good to go. hit all the zerks I needed to & watched the ole grease come out a lil. but not known by me was sometime while greasing, my grease cartridge went empty. it sounded & felt like I was greasing, but at some point I was just forcing air, which forced old grease out making the appearance the job was getting done. after noticing a sound on my spring shackle joints today. I figured out after checking my cartridge that I just put air on joints & pushed what grease was there out.

just is case any one needs this info. do I feel dumb.

 

I got the $59.00 model on sale. with a 15 month warranty.

 

I have always service my truck for the last 13 years, I have maybe had my truck serviced 3 times in 13 years while on the road, due to time.