Figure 14.—Technique of ridge sheets. a, coconut-leaflet sheet with two ridgepoles: 1, main ridgepole; 2, principal rafters; 3, second ridgepole; 4, purlins; 5, thatch rafters; 6, middle whole midrib of coconut-leaf sheet; 7, 7, lower split midribs of sheet; 8, wooden pin. Old Mangaian method with pandanus sheets and three ridgepoles (b, c): b, 1, main ridgepole; 2, principal rafters; 3, second ridgepole; 4, purlins; 5, thatch rafters; 6, third ridgepole; 7, six pandanus sheets; 8, braid passing through sheets and around third ridgepole; c, 7, three lower sheets left in position and three upper sheets turned over to other side; 8, braid acting as hinge; 9, pandanus sheet doubled over ridge with rod end on left; 10, pandanus sheet doubled over ridge with rod end on right; 11, long curved pin (ko) passed through rau pare sheets (9, 10) above rod in each and through male and female sheets (7, 7) and between second and third ridgepoles. The stick pins (11) are usually curved upward and later the pins are twisted so that ends point downward to give better security to covers and to lessen drip of rain through holes.