when a screw slot or Phillips hole or body or hex fails, it is usually because of operator error. The hole has to be sized right, as does the fir of the driver to the insert point. If any one of these is sized wrong, you are likely to cause a problem. It is not the fault of the tool. I virtually eliminated failure of Frearson and Phillips heads when I began making sure everything was properly matched.

When planking boats, you begin to appreciate all of these factors.