Advice to remove a "threaded" allen key screw
There are extractor tools specifically for this sort of problem. They have
a LH male thread, in theory you screw them in anti-clock. and it forces
the stuck bolt out. I dont know if they are effective. Presumably if you
go to a specialist tool dealer & pay high price, you get better quality.
If the thing is portable, your local garage might help, I assume that they
get this problem all the time...
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