Figure 36.—Rim gap and shell fixation: a, last complete coil (1) works from left to right, and when next coil reaches point 2 on left, it is reversed and continues until it reaches point 3 on right, where it is also reversed; coil is continued until it appears on left (4) immediately below first reverse, where it reverses direction to appear on right (5) below second reverse, where it is reversed and ends at 6. b, white cowrie shell (1) with two holes (2, 3) drilled through it; a fairly thick cord with an overhand knot at one end passes through holes up to knots, which act as stoppers; free ends of cords are passed through cap material (4) from without, pushed through again from within, and a third time from without; cords are drawn taut to bring shell against outside of cap and free slack (5) of cords left hanging within; the triple passing of cords through stiff cap material prevents them from working loose.