2 x 12mm for adjusting the eccentrics, plus an 8mm hex key to undo the pinch bolts at the end of the swinging arm. For the sake of being able to get a torque wrench on those pinch bolts I have a long hex key with a 1/2" drive socket brazed on the end. If the eccentrics dont want to move after the pinch bolts are slackened then it will be because the bush in the brake caliper mount has seized - just needs stripping down and cleaning up.
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