Why not just secure it with the nut that the brake caliper screws into? Would save using cable ties!
It's a recessed nut and the bracket is made of plastic. Would be instant death.
You could use a washer or two. Those plastic brackets are pretty solid, far more so than those shitty folded steel ones. I put a 90 degree bend in one using my kitchen hob, so I could mount it using a hole underneath the brake bridge; held find!
@Hovis started
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Why not just secure it with the nut that the brake caliper screws into? Would save using cable ties!