Brent Regan wrote: "Thanks to Fred for the detailed fabrication instructions
on the smooth spinner. Fred's inspiration came from a propeller and spinner
I designed
and built for the 97 Great Cross Country Race that  Fred and I flew in
my IV-P. "

My apologies to Brent for failing to acknowledge his much earlier smooth
spinner design.  

Confessions:

1) Due to my advancing age, rapid decrease in neuronal fidelity, and long
intervening time interval, I forgot about Brent's spinner configuration.  I
picked it up from a local RV-6 builder who was the 2007 Grand National
Champion here in Australia.  He probably ripped it off from Brent!  
2) Whenever I tackle an interesting or novel task, I always start by asking
"I wonder how Brent would do this?"  

Innocent Fred, slow to learn, but persistent.....

PS: Coming next: No more exhaust streaks!  I finally worked out exhaust
deflectors that are scarcely visible and zero drag/zero back pressure, but
genuinely seem to work.  Since I didn't ask "How would Brent do this?" to
start with, it took about seven revisions.  More to follow shortly.