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Nico, the trick is to keep fiddling with the calibration step until PHD calibrates in about 12-15 steps. Shorter focal length -> bigger step. I use about 1500 on a 400mm guide scope. I haven't had a chance to work out the values for a mini-guider.
The balance should be good but slightly east heavy, no matter which of the scope or counterweights are on the east side, and adjust it after crossing the meridian.
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