Paul,
One other possibility is the Odeccker (sic) clamps. They
are one use items but have no gear slots and when properly
set they allow a minimal movement also.
Jan Eggenfellner sells them and the setting pliers, not too expensive.
Bill Jepson

Go to http://www.oetiker.com/usa/start_pr_e.htm

They have some pdf catalogs. Though it is Swiss only prices for the
accessories catalog (in german -  if anyone needs help with german, let me
know) Interesting stuff there!
Clamps especially.
Thomas J. :)

Just checked their Swing Couplings! This would be VERY interesting for those
of you that run test rigs and dynos. If you have to reconfigure conections a
lot, this would really speed up things!
Thomas J.  :)

For the constant torque clamps I don't see any advantages over the Breeze types.
There are a few disadvantages for use with silicone hose. They appear to be narrower
and they are adjustable for a range of sizes. For our use this is a disadvantage
as the metal in contact with the hose is not smooth. We mainly use one size. 
1-1/2 inch. Also the coil spring cannot generate as much force as the Belleville 
springs used by Breeze. Widespread availability may also be a problem. In other 
words McMaster Carr does not carry them. You won't find them in Autozone either. 
I think I'll pass on this one.

On the other hand there is room for two or more due to the narrowness.
Over seas builders may be able to find these easier than Breeze clamps.
In that case I would use them.

There is however a good description of the expansion and contraction problem we face
contained in this gif.
  
Paul Lamar
 
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