From what I remember, the screw they supply is pretty coarse so stripping it would be quite difficult.

My dad used to say, tight's tight and too tight's fxxxed - never helped me to understand how you tell at the time.

As long as it is tight, and there is no movement in the assembly you should be OK. If in ay doubt, drill the hole and put a bolt through with a nylock nut - then seal each end with sealer to keep the water ingress down.

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Never underestimate the power of stupid people in large groups.