that's not a Windtech clamp... it's actually an Atlas clamp
anybody else want to dog me... seems to be my day
Nobody's bagging on ya, Mike.
I use a Superclamp and the solid aluminum Manfrotto extension when clamping off a balcony and it IS far more robust. I don't trust a Windtech style C clamp when putting weight out over people's heads.
But like you said....people have done it countless times without incident. To each their own.
Having locking XLRs on the mics would prob avoid any major disaster if something were to fail but I also use a homebrew safety cable (some Belden 1804a and 2 caribiners with double half hitch knots) just in case.