This is a bike shop in Montreal, Qc, Canada - I think it's a bit far from you, isn't it? It's a piece of an old M950/952 derailleur fitted on the bottom pulley screw, if it can help.
I saw your post about the fix that your LBS made to your XTR Derailluer cage. Can you give me the name of that shop? I recently broke a band new XTR carbon cage and I would love to get a similar protective plate on my new M980 derailluer.