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Use short mush head self tapping screws, then you can easily remove the mirror whenever you feel the need. If the end cover is riveted on with no screws protruding from the end of the scope, you may find that there is no
collimation adjustment possible for the primary mirror. Many years ago quite
a few Newts had the primary mirror glued to the rear cover. A very occassional tweak of the secondary was all that was needed.
raymo
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