Soak the damn thing with penetrene for a coupla weeks and have another go. Forwards - backwards. Or run it on five cylinders till it warms up and try again. I have had some success drilling out a fastener and peeling the thread out with a pointed pick. I suppose stopping any metal entering the bore is a problem, with that idea. I had to run a tap through the thread on number 4 cylinder when I first got my Old Trol. I used a vaccum cleaner with a small diameter rubber hose to suck out the swarf from the bore.
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