Chasing Orthogonality

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Made up two brackets with adjustment screws.  The brackets are mounted in existing holes which bolt the plates to the rings. Now I have a fail-safe way to move the OTA assembly in the dovetail plates.

Spent a few hours (til 2 am) trying to achieve orthogonality, but forgot to correct for half of the error when sighting Polaris.  This resulted in "chasing" and over and undercorrecting for the error.