yeh **** job, limited space on the fronts. First off soak them overnight with some Plusgas or WD40 will do. You need to break off the arms leaving just the metal balls on the Bar and on the arm, then use Stilson's or Mole Grips or both, and gently wind the nuts off, you may be able to just get enough clearance to get a hacksaw blade in to cut the threaded shaft. If not just keep winding away, as you go a bit of heat will generate and may make things easier. The allen key recess is only any use when instaling new ones.