I was stripping My TW125 and gound I need a Clutch holder tool too hold the Inner ring to remove the nut.

What I did was use the strapping from a local pound shop the sort that you strap Luggage or bits onto a car or trailer. It cost £1.00. you wrap the strap round and use a Ratchet eventually it grips the Inner wheel so you can undo the nut and it does so applying even pressure around the whole of the inner wheel. Off cours you wrap it around the opposiste way you want to turn the nut.

Well done billy,, put a drop of loctite on threads when replacing,,,nut,,,

There should be a lock washer behind the nut that you bend against the nut once it has been tightened.