Walt, I appreciate the URL you provide, but that relates to servo mounting screws (which I do already use) and not for the screw that holds the servo arm to the servo hub, which is what zeeb is referring to. I will say that I've never had a problem with the servo arms coming loose from the hubs, but I still don't like the philips head, don't like the little star type lockwashers, and would prefer to use a socket head version, if I could get the right diameter & thread pitch.