I used on carbon/6061T spars...as planned, and works fine but have not sailed in stiff breezes. Got idea from Paine Yacht. Do not have tales of woe to pass on to others.
I have a velcro loop around the boom at the clew of the mainsail (25.6 m² full-batten square-top sail) of my Classe Mini 6.50. Works like a charm in any breeze...
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