Using a resharpened carbide bit (the only way I can afford carbide cutters are by getting used ones) we oh so gently cut the back of the hinges. After a single pass we could see the hardened parts of the hinge which tore up the drill bits earlier.
Keyboard shortcuts are active:
RIGHT arrow - next page LEFT arrow - previous page Page Up - index page HOME - first page END - last page ESC,S,s - toggle start/stop slide show I,i - toggle EXIF info