The cast part unscrews. It is on with locktite, but if you warm it up a bit they just unscrew.
None of my business Jeff ... but it might be a good idea to add this comment to your parts list entry. Otherwise this question might come up often.

I took mine apart and had the lowers chromed.
They sure come out "purty" don't they?



Funny part is that I have never installed these after getting them chromed because of ... KewlMetal fork bottoms. Oh well LOL!