HI..can you describe it a bit better please?........below are two pics, the top is a later style standard, below an earlier one........which bolt, and how is it snapped?.......
http://www.flickr.com/photos/3122848...7621938344655/
http://www.flickr.com/photos/3122848...7615751921626/
(It is an easy job to remove a seized/snapped bolt if you know someone who has a tig welder, and is possible without touching the blue........The technique is that you, bit by bit, build up a column of weld on the end of the affected part, then either drop over a nut, weld it and remove as a bolt, or use a small slide hammer if a pin etc......The heat has the effect of loosening seized bolts and has a capillary action which draws in oil to aid the process)