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You're overlooking the fact that on a 9ft pole in a wind, your Imax will effectively be like you grabbing the end of the pole and pulling it hard to one side.


Not a problem when the rotator isn't moving but when it is it puts undue stress on the rotator on the gears and the motor. Using a thrust bearing transfers that load to the bearing which is designed and rated high enough to take it and cheap enough to be a throwaway item when it fails.