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I replaced the rear brakes today on my 15 Countryman JCW. I have one of the 'magic cubes' that I use to rewind the rear caliper on an Mx-5. Of course, it would not fit my Countryman brakes LOL.
To the rescue, I found that the tightening tool for my angle grinder (or other types of saws) worked perfectly. So, if you're stuck....