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Neat but... awfully complicated when all you really need to do is bolt an old pair of drop bars to the wall...
118 degrees is only for one particular material. Drilling wood, for example, one would cut a different drill point, say 90-100 degrees... drilling inconel otoh would require a geometry nearer 130-135 degrees. Tying yourself down to some vague 118 degree point geometry is actually missing the point.
Interesting idea... or maybe just hold two nuts together to get the 120 degrees?
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