From this Richard I think you're referring to the 'catharpins' that come from where the shrouds converge to the outer edge of the fighting tops, in reality they serve as extra tensioning devices; seasoned seamen would use these to access the next set of shrouds - less able or confident seamen would access the shrouds by passing through the rectangular openings adjacent to the mast 'doublings' - termed the 'lubbers hole'! There is a small spreader bar that provides a link between the shrouds and catharpins. Hope this helps!
Steve
Steve
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