Ihad my doubts about this system. Ithink it's made so that youthread a bolt down onto the top of the aluminum bar, right? Iwas thinking of drilling clean through the bar and the 'socket' from the front and then using a blind nut epoxied into a hardwood block on the back side to hold it together. Probably use a nylon thumbscrew type of setup for ease of assembly. Still have to think about it, will be able to get a better idea of my options once Ihave the formers in the fuselage.