I just made a 40mm(1 5/8") flexfender. Alluminium, no nuts required just two bolts. Probably strip really quickly though. Has a bit of inner tube glued to it as a vibration dampener. I can get pics, but they'll be webcam (until I get my camera from my dads). If people are interested I MIGHT be able to make some and sell them, but only 2-3.
I know im playing around with materials, im trying stainless, Polished Gal Steel and was going to try some hardened stuff that i can get, but thought it may have problems with the "flex" part. Ive just got to wait for a scooter to try them on.
Ill see what I can do
EDIT: I cant find anything hard enough at home, but Im going to my uncles tommorrow and hes a steel fabricator so ill ask him for something.
homemade flexy
one bolt because its big enough it just jams against sides of wheel well its aluminum not sure but whatever its quiet
and ive used it for 3 weeks and no problems whatsoever and its not bending farthur down or breaking