Avondale, made up a 56mm spanner out of 6 X 75 flat bar, I was going to add another 6mm thickness, but a couple of taps the bolt moved, it's a 2 and 7/32 or 56mm nut on the LR1 but the bolt id about 3/4" diameter. Hint on getting the flywheel off the taper, align the keyway with where you might be able to get a hit behind the air duct, I used a piece of timber to protect the fly wheel, a couple of good slogs with a lump hammer, then turn 180 deg, and hit again, that way you are not fighting the key, I got heaps of crap from the air ducts, and accumulated garbage off the fan.