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I have found a little imbalance to be not entirely critical, particularly in declination where it can help keep the worm meshed. I typically balance mine in Dec so the scope will gently move the objective high regardless of which side of the meridian the mount is pointed. Similar for RA though it is not as critical. When guiding, the Dec axis will reverse direction so the backlash between the gears comes in to play but the worst the RA does is stop, it does not physically move East when guiding, guiding "East" slows or stops the RA motor so the sky catches up with the scope.
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