" Note; the aluminum spinner will need some sort of bushing to keep it from wearing on the aluminum pitot tube" .
Don' t you think the existing bushing will cover this Walt?
After all I ordered a spinner at Cummins, only to find out that they don' t manufacture 10" spinners at all.U may want to see if Cummins is still making these. I bought mine 5+ years ago. Recent posts here on VAF seem to indicate that Cummins has gone silent. Maybe someone can advise latest info ??