Mark S,I had another idea to give us more room for
the coupling. Replace the 5" long 1/4 inch hex head bolts with
socket head versions and counter bore the holes in Tracy's
1/2 inch thick adapter plate 1/4 inch deep from the back side.

Maybe I can get Jeff to do this on his version of the adapter
plate. Details details :)

Paul Lamar

Paul,
I was thinking that it would make things easier to assemble if the six
holes were clocked so that three of them were concentric with the 3/4 x
1-1/4 blades so they could be inserted down through center of the blades.
That would leave the other three holes centered between two blades and
should line up with the three blades on the second part of the adapter (the
piece that attaches to the splined hub).  As it is currently, the holes are
very close to the sides of the blades.

Regarding the socket-head bolts, what size ID hose do I need to buy?  I see
that Oreilly's Auto Parts has quite a selection of silicone hose.  I pass
two of them on my way to the airport.

Also, do you have a spare splined hub that we could use for this so that I
don't have to drill holes in flight hardware?

Mark

Another great idea Mark. The socket head 10 MM will fit down
in there easily as will the Allen wrench.

The head diameter is 16 MM or .629 or 5/8th  inches.

This is evolving nicely as all good products do.

Yes on the splined hub. I'll ship it to you next Monday.

Paul Lamar