I drilled my mudguard in the same place as yours, and it's held up perfectly for over 3,000 miles - I wonder what the difference is between the two that led to yours failing?
One of the bolts came undone suddenly on a very bumpy section while touring which probably weakened it, then the sections of cobbles during the london classic finished it off.
I drilled my mudguard in the same place as yours, and it's held up perfectly for over 3,000 miles - I wonder what the difference is between the two that led to yours failing?