While googling the KTR car I found the video I posted and also the following link. There is a company called KTR that makes couplings that look like they could be applied to some of our applications. The call them selves "The Power Transmission Expert".
Here is there Home Page:
http://www.ktrcorp.com/And here is a pretty neat calculator they have that helps you pick a coupler:
http://www.couplings.biz/c ya,
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