When you run the BOYESENS you take the origanl thin metal reeds out, and also the thick metal plates which were the factory reed stops. You use the new 2 piece reeds with the smaller reed on top of the one with holes in it and use the brass metal strips and the screws that came with the BOYESENS. Also make sure to use red loctite on the screws when ou put them in as they will see ALOT of vibration.