How do you change the front fork oil?

[plug]

Is there nothoing else to remove? The only things I've removed from the fork is the dust seal, then circlip, then oil seal, and now the thin washer. Looking down into the fork it look pretty solid. for the oil to come out it has to get through the tiniest of gaps. Is that what I should expect to see? Anf illing it back up looks as though that will take a long time for the oil to seep back through the gap. Is that correct. How do i measure that I have the correct amount back in, or do i have to measure that before hand? In the mean time I'll try turning it upside down and pumping it out, but just want to double check that I'm not way off track in my thinking.

Cheers!