most carbon forks have a compression plug , but my caad 10 has a strange one , so all i can say is if it has the plug then you can slam it by cutting , but if it has the weirdo one you might want to just let the shop look it to see if it can be removed , and if you really want to swap that spacer out it will need to be able to space the bearings , i dont know why you wanna slam a cx bike , but hey GOOD LUCK !!!!