A
Alan H.
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I took a heat gun to it early this morning. I thought about putting it in the oven at 300F and letting it heat soak but didn't.you might try heating the whole assembly up in an oven to 150*f and see if the screw will back out.
you could also break the insert with a chisel and hammer and extract the screw after
Do you have a Manual impact driver? These work pretty well so long as you have it set to loosen and put holder in a secure vise.
I have a snap on that works very well. Used it on many stuck fasteners on F-16 aircraft. Don't overstrike and keep counter clockwise rotation pressure on the tool when striking. Over striking will break the bit every time.
https://store.snapon.com/IMPACT-DRIVERS-AND-SETS-C795597.aspx
Good luck Alan