lets group buy some plastic nuts:shock:AZ STE said:They all do this eventually , I found it was due to the plastic trim that is fixed to the arch, its fitted via holes in the arch, the nuts on the back then rust this travels back up the thread and on hitting the hole in the arch permeates outwards into the metal. Really anoying ,metal on metal contact not good especially on the rear arches. When you come to remove the rear plastic strip youll find all the retainers shear off..