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Kirkus - another option is to fit longer colimation screws and springs to the primary mirror cell so you can move the mirror forward without cutting the tube. I managed to move my Newt primary 10mm forward this way. You need to ensure the springs are stiff enough so the mirror is held firmly but the advantage is you can always put the original screws and springs back in later.
Another option is to use a Barlow although this has the disadvantage of narrowing the field of view.
Peter
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