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JockyC said..
This is what I use, and it is excellent! Never had a problem, doesn't damage the sails at all and is rock solid if you have the right size! Easy to make and cheap.
+1 above. I've used such claws, as well as the real, $20 Gopro claw, both for boom and mast.
Beaten the bejesus out of it, and it holds well.
For safety rope for the mast mount, I use a 2nd grip a few inches above.
Go cheap !