this - ".... turn up a top hat-looking adaptor. Now blue the spindle end, let it dry and fit the rotor on the spindle."
in - http://www.stovebolt.com/techtips/discbrakes.htm
leaves me scratching my head. 'turn up', as in, on a lathe? 'blue the spindle end'? is there a more detailed version somewhere, or is this process only intended for adults?