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Lee, there are several type of T-thread tilt adjusters on the market, they work like the GSO focuser collination ring but are much smaller obviously. Teleskop-Express have a couple that would suit. With the 1600, the face plate is, well should be, flat and the sensor perpendicular. You might check to make sure the sensor is not raised on one corner, i have not heard of any mounting errors by ZWO but you never know. Good luck
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