Purchased parts include pleated Redi Shade (folded paper), sliding screen door replacement hardware, and easy-slide pads. The wood is from scraps. String is fish line. Total cost = $22.The control mechanism is like that of a drafting table parallel arm. A line runs taut through rollers in a figure-eight pattern. The metal drop handle keeps it from tipping over while opening and closing (done with a hollow bamboo pole).
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