I can't figure out how to get the upper bolt off for the life of me.

I have cut off a piece of M10 Hex and stuck it in the allen head. I tried several techniques to loosen it. Sprayed with Aero-Kroil. Nothing has broken it free.


Help....Im out of ideas

UPDATE: [I wrote up the entire job, and the solution to this problem here: Pictorial: W123 300D Turbo Starter Motor Replacement

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car