I've restored a few Tuf Necks but I've just bought a Pro Neck which I plan to strip and polish. The great thing about Tuf Necks is the fact that, by undoing the large bolt, you can remove the quill which makes the stem really easy to polish. I (carefully) tried to loosen the bolt on the Pro Neck so I could remove the quill but it is rock solid. Is it possible to loosen that bolt on a pro Neck or is it fixed and just there for show?