Here is something I came up with after studying many inferograms some from RC Optical designs and lots of different sources. I get a little out side the square to test limits, and to practice before I build a 20" RC nesmyth. Here is a pic of my 15 point support, the outer circle is 305mm Dia you might be able to enlarge it to scale from. All the notches are to relieve the material so each point will flex with equal force applied.
Well I got this far and can not figure out how to post an image. Bugga
