Dave, Catto did do a one off or us. He made two at the same time. I had one of his three blades on my RV 6 and I loved it. I knew from the start I wanted one for the Zenith. The spinner is from Allan Cummins in Australia. What a sweet combination at least that is what I think! Catto now has all the data to make them for the Zenith an UL.