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@.ben
I've sheared one of the original carradice bolts before (granted I was definitely overloading).
Since then, have replaced both my bagman clamps with a high tensile m8 allen bolt, which doesn't slot as nicely into the countersunk part of the bottom block, but has been (anecdotally...) completely fine with quite heay loads. I do also keep a spare in my tool bag just in case...