I had the same problem, and I just drilled them out. just make sure not to drill into the hub assemblies or anything like that, it would decrease the structural integrity of the screw joins significantly (it would force the screws to hold the hub out over a distance allowing much more tortion on the screws). So... just be careful when you drill/if you drill. (a good idea if you have one rotor off is to see if your drill bit will go into the rotor when the top of the screw comes off like a rink on the drill bit, thats a really easy signal to stop). I found as soon as I drilled them I could take out the rest of the screw with my fingers, so hopefilly that won't be a problem for you either.