A 2mm hex key will fit too, it needed some frantic pounding, and a bit of heat on the gears but it went in. :D

cut 30mm off the hex key ( any more and it bends ;) ) and taper one end.
next, beat the life out of the pin...it will go in slowly
I found heating the gears made it go in easer (well It is -4 here:W: )

cut off the excess, and the jobs done ...........................it won't be snapping that any time soon