Bugaboo Cameleon Fitting a replacement brake shoe

Hi, We snapped our brake shoe off the left side of the chassis, the oppopsite one to the side with the brake lever. However we are unsure how to fit the other and remove the snapped shoe. Bugaboo have sent us the replacement part but no instructions on how to fit it. We have taken out the small grub screw but the fitting seems to be spring loaded?! Bugaboo just told me to snap it off but it doesn't seem right? I don't want to have to buy a new chassis! Would appreciate your advice, many thanks.