Like the title says it seems like a simple request. After all we have put men on the moon, can determine if a person has committed a crime by running their DNA, and we can install a micro-chip in a dog to tell who the owner is. Why then can’t someone make a simple hand-operated grease gun that does not leak and is easy to refill? I have one that is probably 20 years old and looks just like the ones for sale at Wally World or AutoZone. To install a new grease cartridge or refill the old cartridge I wear latex gloves, spread newspaper on my work bench, get a box of rags, and I still end up with grease all over the outside of the gun and half of my garage. When you install the new cartridge there is always some grease in the bottom of the tube that slips past the plunger and of course it squirts out the little hole in the bottom of the gun when you are trying to screw the cartridge back on. I have an air operated grease gun but don’t like it because you never know when it is empty and no grease is going into the zerk fitting. It really seems like such a simple request.