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I have thought this myself, it's not like I was jumping off curbs or anything. This one broke on the A44 just outside Wyre Piddle, it's a perfectly smooth piece of road.
I'm not sure I even used a washer so that's a good point. Soft would be not metal?
It's hard to say if the 'fender' was stressed but the A44 is a bit of a shit road, so maybe. I definitely was when it broke as the rear section went up inside the front section and jammed the wheel while I was being overtaken by a massive HGV...
If they all break at the same spot maybe it's you.
#friendlyface
Do you use a soft washer of some sort?
Is the fender stressed, or is it following it's natural curve?