I wish I had had this product many years ago. Has saved my joints and discs from scrapes and the need for touch ups. In either case, to install the valve stem, you simply remove the valve core, insert a tool through the hole in the rim, screw the tool into the stem, grease the hole, and thread it through. MUCH easier than doing it by hand. I tried another valve stem puller but couldn't get it loose so I got stuck. This one is way better. I see in other reviews that people say their cable is broken. I would definitely buy it again even for a one-time use.