Gunna or who ever you are now, when you get this tool check that the bolts all run through the 4 threaded areas and come through the bottom without any issues. Also the air line they supply you with that goes in the s/plug hole to fill the cyl with air to keep the valves seated while changing springs May have a schraider valve still fitted in the bottom of it which will not let air into the cylinder. Which in effect leaves you open to possibley dropping a valve while changing springs. You only need to remove the valve and it then will do its job. I just bought a tool last week and had these issues and had to retap the threads all the way through as the bolts would not go through the base of the tool. Hope this helps.