he knows the size, but cant get hold of one.
End of a screw driver
Take off a door handle in the house use a 8mm spanner and use that pikey spec FTW
oh right. didnt read it properly obviously. doubt you'd get enough leaverage on a screw driver.
Shouldnt be that tight for you to need to put loads of effort into it.
Mole grips
Get a spanner around the 8mm end
A slightly ground down 3/8 extension worked for me until i got an 8mm.