To Iwadmin - I use polypropylene (code 5 plastic) sheet which I find on ice cream containers at the supermarket. Look for the 5 within a triangle. I also use polypropylene that I found in a shop selling table place mats. It was clearly marked `polypropylene` and one placemat is enough for several hubs, - and very cheap too! Thickness - only about 20 thousandths of an inch but I have found this OK, (for up to .40 power) and nice and flexible, stiff hinges are not wanted! However I am interested in comments from others on this subject.
Colin Duthie.
ps - Hope to have photos of my Gyrace 2 tomorrow.