I need to put a permanent set (arc of a circle approx. 6..8" radius) into some 1/16" x 5/8" Tufnol strip. The stuff can be bent quite easily to very small radii and when released will spring back to the required radius but it appears to have a memory and, over time, will straighten further. I believe that heating will teach it some manners but unfortunately I don't have enough spare to risk sacrificial experiments.
Any ideas?
The application is 'passive' (i.e. Dummy) leaves of a leaf spring assembly. The top two leaves are tempered PB and do all the real work the rest (Tufnol) are purely cosmetic.