I was fitting a set of Givi pannier frames to the XTR and overtightened one of the bolts which holds the little button that secures the bottom of the pannier box. The button has cracked into three pieces. Here's the one on the other side, item 11 on the instructions:
Apparently, Givi don't supply separate items or spares (according to the place I got the frames from). Does anyone have one lying around that they might swap for postage and a couple of beers?