Part 8 of an International Correspondence Schools instruction paper on silk throwing, continuing the coverage of combination machines. It describes other makes of doubler-spinner, the spinner-doubler, and three-process machines (spinner-doubler-twister), covering stop-motions, drop wires, feed-rolls, spindle drives and belt tension, gearing, and brakes. It also gives twist and production calculations with worked examples and change-gear tables, plus notes on tying ends and faults such as caterpillars and corkscrew threads, and ends with examination questions.