Seems like every time I change the cartridge in my grease gun I make the biggest mess. I done it many times over the years and I still haven't mastered the process. Greasing the truck is the fun easy part....'till I have to changes the cartridge. Eventhough it comes in a nifty cardboard tube, I get more grease on the outside of the gun than inside! What a mess I can make. Good thing for rubber gloves!