im trying to install ipodMOST interface little problem when installing optic cable 1 to H housing it does not stay in it comes out unlike optic cable #2 it stayed in place there is a little blue pin on housing H do i need that to keep it in its place?i tried but does not go in into X18180 housing is there a way that it stays in ONE MORE THING WHEN AFFIX INTERFACE do you affix it to bottom or top where cd changer use to be. im thinking using heavy duty velcro and sticking it to bottom where changer used to be . good or bad idea? thanks all