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Sorry, I misunderstood. There's an M8 Allen bolt at the bottom of the fork leg in the curved bit where the axle goes. When refitting, don't forget the copper washers. Here's a diagram....http://www.cmsnl.com/honda-cb400f-england_model14639/partslist/F01-1.html#resultsThe circlip only secures the seals and doesn't need removing to separate stanchion from fork lower.
If the bolt is spinning around in the bottom of the stanchion or is mashed up,just drill the head off then pull apart.when u get it separated just take the remainder or the bolt out with pliers.Simples