I had bought the velo orange 650b guards for Isen bike as it appeared that was what you suggested but they needed a lot of fettling to fit. The rear has now snapped, what guards are they that you have on your bike?
Possibly didn't help that you fitted the leather washer on the other side of whatever weird, knurled spacer that is that looks like it was digging nicely into the mudguard there.
I had bought the velo orange 650b guards for Isen bike as it appeared that was what you suggested but they needed a lot of fettling to fit. The rear has now snapped, what guards are they that you have on your bike?