Collected (the instruction is worthy of a separate essay - tear off your hands for such instructions). When turned on already at the first speed, the fan chatters. All possible options with the "tuning" of the fan blades (as far as it was possible - checking with a plumb line, weighing on a scale) did not give a result. Took off the blades. Imbalance. Then the blade holders - no result. By placing additional washers under the fasteners of the blade holders, it was possible to eliminate the problem (it took about two hours for all sorts of combinations of setting weights to identify the cause of the imbalance). So if you are ready for such a quest - I recommend it. As an option, the blades can be turned white side down if you do not like this color.
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