Re: the coil . . . An older RGP post indicates that A-14418 is a choke, meant to filter out the bass sounds in the backbox speakers (leaving them for the main cabinet speaker). There is no plunger in the coil. Funhouse manual & parts list calls A-14418 a "x-over coil assy" and A-14292-1 as the "x-over coil & brkt assy".