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Don't try it. Do not assume the secondary spot is centred in a traditional way. The secondary spot is used by the factory optics team for initial alignment and has no practical use to owners. This has been discussed on the Cloudy Nights forum in previous years. I am dismayed when I hear that people have tried to mess with the MN190, as the secondary setup is critical to performance and much less forgiving than a normal Newt. In particular never try yo mess with the secondary offset, it is factory set and critical, as it is mounted directly onto the rear of the corrector. This is one reason that after market focuser upgrades usually fail (unless the Moonlight and its special adaptor is used). Leave it alone.
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