While I don't disagree with the usefulness of the French curve mold supplied with the heat bender kit as demonstrated here, having used this tool now for many years, I have ceased to use to bending mold, and have found that by wetting the plank to be bent, I can just lay it against a hard, flat, heat resistant surface and bend the plank to the desired shape, just sculpting it free hand with the hot bender against the hard, flat surface to any curve (and even twist) I desire. If I don't like the result, or want to "tweak' it, I just re-wet the plank and repeat the process as many times as I like in order to get it just right. If you find the French curve mold to be useful, all well and good. I, however, no longer find it necessary.I have found the free hand method to be liberating.