Got the MSD setup in....and

ooops. i thought i read 2 lite silvers! the metering rods on the top airhorn are held in place by a torx screw that holds a cover over them. if you undo the torx screw, you can carefully remove the metering rod/piston. then you pull the edge of the spring retainer down that holds the rod to the piston and the piston will slide out. then replace it with the # that is stated in the book. when re installing the rod/piston assembly, drop it in and carefully press it down to make sure its not binding.