Reid, I have a possible solution for the problem. In my work we install a
lot of small size satellite dishes. One model has a clamp that drops over
a short pipe mast. To help the slippage at that point the manufacturer
inserts a piece of sandpaper in the clamp to provide extra friction against
the pipe.
The same idea might work between your clamps and the fiberglass. I think
there must be some sort of waterproof sandpaper or emery cloth that might
last a while in the outdoor enironment.
73 Jim KI7Y
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