The M-uno can manage without problems a certain amount of unbalancement. Let’s say that up to 1 / 2 kg there should be not issues. Obviously the more the unbalancement, the worse the behaviour in guiding tracking. This may change on depending on the focal length and other relevant setup specs. To check this just perform a calibration or analyze a PHD2 log file. So 20 grams can be considered an irrilevant unbalancement weight for the mount performance. Best regards
Stefano
Avalon Instruments Team