The intermediate plate is screwed to the rotor of the above ignitions with the supplied screws. We recommend securing the screws with Loctite. The supplied M6x25 countersunk screws are suitable for PVL ignitions. When using MVT ignition, the supplied M6x14 countersunk screws should be used. Weight with screw 110 gr, fan can be attached to the adapter plate Ø inside: 24,5 mm Ø outside: 65 mm thickness: 4mm The extra weight gives your engine soft, smooth running when stationary and improves the "starting behavior". Depending on the setting, even more torque can be achieved with the extra weight.