i have in the past heated the tip of allen driver on gas ring (using gloves to hold driver of course !!) until cherry red in colour then transferred to allen socket allow heat to penetrate bolt a little (if its stuck in loctite it oftens softens the loctite enough to release the screw
do this at your own peril and safely
same as previous post a dremel with tthin cutting disc and form a slot to allow a flat screwdriver (increased torque is applied )
regards dave
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