I am really fascinated with Steve's design. I think it could
be a major breakthrough in the cost of PSRU's.
His use of low cost off the shelf two inch hollow shaft was a brilliant idea.
For those of you not familiar with the QD coupling here are a couple
of pictures. The coupling works by friction alone. I think the torque 
capacity of the this coupling could perhaps be enhanced with three 
more bolts. 

I think you could sell a kit Steve. You could save people money by 
offering such things as thick wall aluminum tubing cut to the 
proper length for the housing. Also perhaps other machined parts.

Paul Lamar
 
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