Put it this way, there may or may not have been a bit of loctite applied to the nut when mine were fitted, the mechanic who did it said he hadn't but when I went to loosen the rear brake side the bloody bolt sheared off as the nut tightened against the hanger as I turned it! A quick trip round the corner saw it quickly fixed foc and I now have probolts fitted but thought it was worth mentioning as I may have sworn a little at the time and as you know you can't get spares - not even the bloody bolts. BTW I've also noticed I'm catching the offside carbon heel guard with my boot as you mentioned on yours, not sure what the solution to that is apart from soft boots!