I've got that tool, but it an older version. I've used it a couple of times on farm equipment. Like Stu says, it makes you wonder if you want to push all the crud back in to the bearings. I found that its a messy tools to use, as mine will spray oil out the sides when you hit it. It will open up the old style zerks also. I dont remember the name of them, but they dont look anything like a modern ones, and cant be replaced. I think that in the end unless you have a drive -in zerk that you cant replace, you would be better off just getting new ones.
