[Synchro909]

I concluded that the problem was a combination of poor quality clamps and the glass being so heavy so I have converted to an acrylic (or is it polycarbonate?) wind wing which is much lighter. They do get scratched over time so I simply replace them. Glass is difficult to drill holes in but what I use is OK. I drilled through the clamps and the wind wing and put a 5mm screw through them all. I expect no more trouble EVER!