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It depends on the scope design, in the case of newts, if you like to stand it up on the rear cell they do not make sense. My old MN190 also had recessed Allen keys and screws, and I had purchased a set of Bob's Knobs but never installed them as I store the scope standing on the rear ring and the knobs would prevent that. If the scope is permanently mounted then I guess it would be ok, but few are. An un-necessary accessory on the back of Skywatcher newts imho.
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