Have broken not one but two window arms today ( she who must be obeyed won't let me forget it either), and can't work out how to replace them. The bits attached to the window frame are held in with two cross head screws , thats not difficult, but how do i swap over the parts that are fixed to the window itself are they stuck screwed , do they slide , is there a grub screw or something holding it in place - Avondale Dart 2003 - How stupid am I ???