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Hartzell CS Prop

I bought a runout IO-320 from a Citabria along with the prop. The prop is HC-CZ YL-4F. 72" dia.
I'm fitting the fiberglass spinner that came with the kit (RV-6A) and find that it's too tight, that is, the diameter of the blades at the base of the counterweight is 11.25" while the diameter of the spinner is only 10.5" at that point. In other words, the spinner slopes inward too steeply to accomodate the prop blades.
Has anyone ever solved this problem? Is there another spinner out there that will surround a -4F prop?
 
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Check the Hartzell for an AD on the hub. I'm curious as to what the smarter guys here say about the compatability of that prop with the RV speed range.
 
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