The concept for the Slot, to facilitate mast raising, came to me a year-and-a-half ago. The idea of the Plug, to fill the slot and hold the mast upright, was part of the original concept. How to hold the Plug in place took a while to figure out. Here's what I came up with:
Slot:
Slot with Demo Mast:
View of underside of Plug/Cap with turn-buttons lined up fore-n-aft:
View of underside of Plug/Cap with turn-buttons athwartship:
Plug/Cap in place:
Below deck view of Plug/Cap in place with turn-buttons fore-n-aft:
Below deck view of Plug/Cap in place with turn-buttons athwartship (no worries about that knot):
This configuration works well - sitting still in the Boat Bay: the Plug/Cap just does not move when tightened down. But I expect it will work just as well on the water.
One more design element is, what i call, the Mast Block. My intent is for the block to help support the mast (although that may not be its primary purpose) and to provide an anchor point for the foreward ends of the cockpit coamings (probably its legitimate purpose) and the downhaul. It is a work in progress.
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