A Tool Followed Me Home.............One I Didn't Need.......

I developed a leak in one of my Mazda B2600i tires a few weeks ago but could find any screw or nail . When I pumped the tire up to 50# and pulled the air nozzle off the valve stem the entire core shot out . The thread insert separated from the valve stem body .
I went to Amazon and bought a cheezy looking tool that claimed to replace valve stems without removing the tire . IT WORKED GREAT ! Less than a minute to replace !