[AZ 67 C10]

A grease gun that doesn't leak=million dollar idea. I've used pneumatic and hand pump grease guns every way, shape, and form and have never had one that didn't leak. Pulling the cartridge out sure would stop that but putting it in a 5 gal bucket or a rag around it is how I do it.

The lever does hold the T-handle in place when pulled all the way out.

If you only use it once or twice a year and don't like the mess then pull it out and use some caps or similar to keep contaminants out of the cartridge.