Thanks Pelagic for the answer to this question. He used a triangular head screwdriver for his project. The are 3 little detents in the decorative rotor screw head, the whole thing rotates off. I did not have a triangular head screwdriver and was going to grind down a square bit to a triangle shape but I found that a T-5 star bit was the right 1.2mm size to catch those detents perfectly.