Geometry
Hi Bob,
If the lengths are right, the upper terminals of the extenders will be just at the height of the mast's pivot point. So, with the addition of fore-and-aft bridles, made up tight, the upper shroud, without needing tending, won't go slack as the mast is lowered. Thus it can provide lateral support for the mast. The only other way to accomplish this is to have the mast's pivot point at the same height as the chainplate pins.
Fair leads,
Brion
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