An installment in a series by Paul O'Connor on double weave, covering four-harness pickup double weave. It explains threading as a straight draw twill with dark warp on harnesses 1 and 3 and light warp on 2 and 4, the use of a pickup stick, and a four-step weaving procedure, with diagrams of stick positions and weft shots. It also gives a variation alternating light and dark shots, a two-stick option, and advice on charting designs in pairs of warp threads. It mentions that later articles will cover 6- and 8-harness double weaves.