A short tutorial by Ralph Griswold on using integer sequences to generate threading and treadling sequences for weaving drafts. It explains modular ("shaft") arithmetic, wrapping sequences such as the Fibonacci numbers, squares, cubes, and a "multi" sequence around a given number of shafts, and shows drawdowns for 4 and 8 shafts. It also covers finding integer sequences online, converting them to shaft sequences by taking remainders, and handling zero and negative numbers for downward straight draws.