Thanks for your reply. The bottom nut screws out, which I believe allows the oil out. But the fork does not appear to come apart. I must be missing something.
As Adrian says, the damper tube may be a bit tight at the bottom of the leg.
As Hitchcocks guide says,
. The alloy fork ends should then pull down and off,
but you may need to give them a little encouragement with a
rubber mallet if the spring stud is a tight fit in the alloy.
Once removed be aware that there is a loose “oil control
collar” on the end of the fork spring stud. This may drop off,
or may have already fallen down in the alloy fork end.