u/Electronic-Sir-4875

My hobby is to buy broken Milwaukee tools for cheap and fix them for my own use. I got this M18 grease gun in a job lot and its missing the tube. The tube is pretty expensive so I thought about turning an adapter to fit a SKF greasegun tube I have laying around. The problem is that I cant figure out what the thread pitch is on the milwaukee tool, I thought it was 1.5mm metric thread but after I turned a piece I could not make it fit. Is there anyone who can measure the outside diameter and thread pitch with a gauge so I can find out if its metric or something else and make an adapter?