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The drawbacks of the Cleco's supplied are well known (assymetry, small 
lip etc.) I have "inherited" some "Kwik-lok"'s.  They are symmetric and 
you use a tool like a pair of pliers to compress a heavy internal spring, 
insert the shaped ends in the hole, and on release of the spring, a 
central tongue is forced between them. The whole operation is one-handed 
and instant, resulting in a firm grip which has not so far pulled through 
anywhere without using washers.  Unfortunately I don't know the source or 
the price, but they are well worth a search.
gemin
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