It is most definitely original and common on low-end frames - you attach the brake by bolting it through the big hole in the centre. You need a 'nut fitting' brake (which is the type I have linked you to) rather than a 'recessed allen bolt'.
@lae started
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It is most definitely original and common on low-end frames - you attach the brake by bolting it through the big hole in the centre. You need a 'nut fitting' brake (which is the type I have linked you to) rather than a 'recessed allen bolt'.