I just had the same problem with mine.  After trying everything that you have 
mentioned plus an impact screw driver, I drilled throught the center of the 
screw and used a 1/8" screw extracter.  Took 5 minutes after spending hours 
on other methods.  Just be careful that your drill throught the center and 
don't bugger the threads on the body.
Gary
59 Bugeye
59 TR3A
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