A short mathematical paper expanding on a method from Masson and Roussel's Shaft Weaving and Graphical Design for making symmetrical profile designs with independent blocks. It explains that a profile threading, a treadling "as drawn in", and an involute tie-up together give a symmetric result. It tabulates the number of involutes for two to eight blocks, with the recursion formula, and illustrates all 26 involutes for five blocks. A second figure gives the corresponding profile drafts.