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by k1w1 4588 days ago
It is strange that the wikipedia article describes the shaft passer as hypothetical. They are widely used in yachting harnesses - it allows your safety harness to be connected to the life-lines and can roll over the stanchions as you walk past them.

Anyone who has done the bridge climb over Syndey Harbour Bridge has used one too. Unfortunately I couldn't find a good photo of the harness and connector.