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(https://i.imgur.com/aGstULY.jpg)
I tried soaking it in oil, hitting the sides with a spanner (not that hard) and heating it with boiler water. Is there anything else that I could try? I don't have a blowtorch.
Could try some vice grips on the outside and just make sure they are clamped very tightly...sometimes it will work. But even a small lighter would be better than nothing, heat usually does the trick.
Update: I bought a vice grips and boy can it grip. I gripped it so hard, I could barely close it so that I could get enough purchase on the round head.
This I can report has worked well! Then it worked almost too well where one of the heads snapped off as I was turning it:
Show Image
(https://i.imgur.com/UInw7HH.jpg)
The other sides are gradually loosening so I'm using the oil to loosen the rest of the screw up as it's coming out. I hope that the bolt that's left inside will not mean that I cannot take the unit apart but I suspect that I will be unable to. Does anyone have any advice on how I might be able to recover from here? Thanks in advance
Do you have a CNC EDM cutting machine. ??
/jokes
if it's really important, you still may be able to chisel a slit in there to use a flat head.
But there are more expensive methods.
https://www.osseonews.com/shop/neo-fractured-screw-removal-kit/