....the new version as according to Honda this has now been superseded by 07908-4690003, like so:
...and the one I already have, IE one of the double ended clutch nut/swing arm sockets like so..
Now reading the Haynes is shows the adjuster nut (having been torqued up) being held in place with an Allan key through the middle of the first tool shown above whilst the appropriate torque loading is applied to the lock nut via the square drive on the tool arm. The Haynes even goes on to point out that the torque value quoted has already taken into account the additional distance (torque = force x distance) introduced by using this tool.
This “original” tool is now not particularly easy to track down, and when you do find one it is bloody expensive for what it is – circa 90 quid.
Moving onto Hondas own Superseding item (second pic above). I can see it has flats on the side of it so you could get a spanner onto it, but the only way to get the correct torque loading on the lock nut would be to have a crow’s foot adapter that was the right length to emulate the original tool, and I am assuming there is access down the middle for the required Allan key.
Finally onto the double ended Clutch nut / Swing arm tool that I (and I am sure many others) have. Whilst this fits the lock nut and has a square drive in the middle so you can get a wrench or torque wrench onto it quite happily, it would at the same time block access to the Allan key end of the adjustment nut you are supposed to hold whilst you apply the torque to the lock nut. Furthermore the torque quoted in the Haynes is specifically for the original ‘special’ tool and the extra distance effect calculated…so torqueing straight on means the values are different?
So – how do people actually torque up their swing arm lock nut and to what values?
Just wondered what the rest of the purists and spanner monkeys were doing before I re-invent the wheel. 
Im all for doing things right but ive always thought the procedure for this is a little overkill.