Vance's suggestion has really cut the cost of a home made constant speed 
prop. Here it is. The ball filling holes are plugged with a hard steel
screw that is machined when the hub is machined for the ball races.
The screws are removed when the hub is assembled to allow inserting
the balls.

I cut the pitch change  yoke down so no hand clearanceing will be necessary.

This is about the simplest and easiest to make constant speed prop
hub I have come up with so far. Thanks Vance for that suggestion. 

I will work on the part drawings soon. I also need to do a few stress
checks. 
 
Paul Lamar
 
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