"Sandy Morton" wrote in message
...
In article , Doki
wrote:
I'd be tempted to cover the whole thing in a liberal quantity of
WD40, plus gas or similar, then take a hacksaw to it and cut a slot
in the end of the allen bolt, then unscrew it with a big
screwdriver.

Plus gas then the angle grinder to cut a slot and then a great big
screwdriver should work.

You must be a lot neater with an angle grinder than me . Or perhaps angle
grinders come in sizes other than "massive".