Reto Brehm's P5 proa "Lili'Uokalani" with a shunting Oceanic lateen rig.
There has never been a completely satisfying way to reef a crab claw sail. If you just furl up some of the area along the boom, you still end up with the sail at full hoist, not the best place for the area when the wind is strong. Reto rigged a ring or loop of beads that slides down over the halyard to lower the yard and yet keep it tight against the mast. The control line is led out to the main shroud to give a new support point to the mast and prevent any excessive bending.