This is much simpler: After tightening the bolts in the rotor housing, place a large 'glob' of RTV silicone seal on the head of the bolt and filling the cavity in which it is mounted. Be generous! When the silicone seal cures, it will prevent ANY loosening from vibration .. and will be easy to remove [unlike Penetrox, etc..] when you wish to remove the rotor from the tower. Don - N8DE