Pure genious this is..
Carry one of these babies around with you on your keyring, and when you snap your mech hanger, pop off the bolt/QR, screw the mech out of the snapped part of the hanger and then put the 'hanger saver' behind the bolt/QR and use the threaded part of the snapped hanger as a bolt to secure the mech to the 'hanger saver'.
Propper job, hanger fixed. Well, it will let you carry on with the ride!
Of course, you could always keep the hanger saver under the bolt/QR and mech all the time if you wanted to and that would stop snapping the hanger all together!! The holes are 30mm appart from each other, so should fit a wide variety of hangers. (It will fit any snapped hanger)
I made something like this a while back with 0.5mm thick steel, it was too flimsy and just bent. I have a few foot of 2mm thick flat Iron here, so am going to make a few decent ones, pollish them and lacquer them up. So if you want one, PM me :P
Sam