ginger pom said...not true.
First successful clamp boom was a french company called Seabright
aaaahhhh the Seabrite
.......Takes me back to 1987-ish
-I had just purchased a weird boom based on a hunch that it looked like a good idea. (maybe from an ideas man like Flips Father or Grandfather!!

)
It was a Z boom, which just happened to have a Seabrite clamp on front end.
It had a wire that went around a plastic bracket and was a pain in the butt to connect. Then it had a plastic screw-in knob that was the fine tuning, tensioning device. ....and a plastic lever with a "frog" logo on the front (must be a French thing).
.....anyway, I thought it was the bees knees. I remember connecting it up and marvelling at how rock solid it was compared to the crappy rope and cleat crap we'd all been using up 'til then.
On my first run, I did a jump, landed, and heard a gun shot go off!
...it was my mast snapping, in a clean break exactly at the boom![}:)]
(my good epoxy excell mast)
Bees Knees, my arse.
Then I realised that the little cracking noises I had barely heard as I had tensioned the clamp were actually significant!!

Lesson learned. Have never over tensioned a clamp on boom since.