ORIGINAL: rangerfredbob
pull the cooling head off first, then drill the head of the screw off... that will give you plenty of room
i would not
remove the head
too big a chance to get shavings/filings
in the engine
and that would be bad
i would drill the head off
since there's so little room
done it a bunch of times
it's really easy
and i have yet to
dull a bit
or damage any thing
you just have
to be carefull