Smallest clamp possible?

I find these small Cieco clamps are often useful. They open a little over 1/2".

34X34SG.jpg
 
I really need more information about what you are trying to do before I can offer a solution.
 
The OP seems to have abandoned us.

David
 
But then there is always the concept that we all have (some level) of machinsts skills here - and you could always make something.
 
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