An automatic rivet loading module which includes a pusher mechanism, a gripper mechanism, a mandrel receptacle, mechanisms for moving mandrels in the mandrel receptacle, and a tool activation device. The present invention is further directed to methods of forming multilayer circuits utilizing the above composition and the use of the composition in high frequency applications. A decoy cover having at least one outermost panel is disposed in relation to the outer wall to obscure the release mechanism. In a method of manufacture of the braided spar, a braided sleeve is formed dry over a mandrel by a multi-axial braiding machine.