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Have you purchased these used? There is a lock ring under the bearing please make sure that is tight and there in no up and down play. Did you check the top pin on the KW was suitable diameter etc?
What are you using as a spring top hat? The correct AST one would then accept the black plastic bearing and collet (the black middle parts in the image), the anodised part then sitting on top of that.
What are you using as a spring top hat? The correct AST one would then accept the black plastic bearing and collet (the black middle parts in the image), the anodised part then sitting on top of that.