Drill the head off the screw, Use about 4.5mm bit (The size of the Countersink)
then the motor mount should just come out. Obviously you will have the thread in the motor plate. You may be able to remove the rest of the screw with some pliers or mole grips
if all fails, Grab some Hydrochloric Acid about 36% (HCL)
Drop the alloy in the acid, The alloy will not be effected by acid, but the steel screw will dissolve.
Thats the best way to avid damage to your chassis or the alloy part. But it will take some time.
Or if your not too bothered about a few marks on the chassis, dremmel a slot into the screw and use a flat head.
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