I wouldnt think a loose braket would cause as much of a problem as youre making it sound...I mean it should still tighten it up at least to make some resistance.
I remember messing up mine where the cable connected to the caliper and having to redo that twice...check there I guess (Im running out of ideas...)
Well hey, youve got nothing else to lose, so try the cross-over idea...though I dont think it will really work and depending on the angle you could bend the line (try it and see).
Im sure you already tried the adjuster nut on the brake handle.
Man this is pretty strange... Most people have issues w/ one being way too tight and one being loose because of it - cable stretch over about a week fixes that...
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