I have personally suffered a sheared pin, which caused a WHOLE lot of pain and suffering (missed a friend's wedding and the boat that was to send the Pantera to me in France).
I'll never forget that, and have mine double-pinned.
My post is to comment that I've suffered first-hand this problem, and have read numerous times that the pin is just too weak, and there is no downside to double-pinning it.
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