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Next we need a way to do polar alignment. A quick method is to point the hinge to Polaris (the Pole star) for a rough alignment. The simplest hardware that would allow me to do so would be a plastic straw glued to the hinge as a finder-sight. However, I chose to go with a cheap Daisy Electronic BB gunsight which not only allows calibration in two planes, but would also be more comfortable to use than a straw. Such gunsights are available wherever BB guns are sold (e.g. Walmart, Bass Pro, etc.). I got this piece off Amazon for $9.75.

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