Middle section of metal part of the mount.
Does yours curve over the caliper like mine (Brompton) or straight-line (CatEye)? I tried the CatEye one and clearance was an issue - it was workable but contacting the calipers
This what I had before I got a black version which was not as robust which they broke the same place:
@infmz started
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Middle section of metal part of the mount.