Had to put the heads of the hex screws in, maybe 1/16 inch of the gasket was missing through them, not the outer shell of the tool, you can see in my one photo where I ground the heads down for one proper release. After this tool worked flawlessly, another one was added to the toolbox. FYI, only works on 08-10 6.4 not 6.0, they use a different tool.