Stuart Grasshopper – beam pivot supports; puzzled

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I’m making the Stuart Grasshopper/Half Beam engine. I’m currently machining the brass beam pivots. The plans call for the 1/2″ diameter pivot section to be 15/32″ long, but the beam is 1/2″ thick where the pivot runs. That means that when the other part of the support is screwed home, it will clamp the beam. Am I missing something? Has anyone made this engine and can tell me where I’m screwing up? Surely the pivot want to be a few thou over 0.5″?

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