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.