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Replacement 2" holder for Quattro focusers that features a brass clamp ring and much tighter inside diameter tolerance to better hold imaging accessories like a coma corrector or focal reducer. Minimizes tilt in the image train and brass clamp ring prevents damage to eyepieces and accessories. The ring does not add any length to the stock focuser, making it compatible with most coma correctors and focal reducers, including Starizona's Nexus. Includes stainless steel thumb screws.