Just thought I would mention something I read on another forum. Seems as though a new owner was concerned over the accuracy of LX90 ACF. He changed the gear ratio and accuracy improved. Another member questioned him about the need to change the ratio. Eventually, the Dec gear cover was removed, and gear teeth counted.
It seems an LX90 should have a 154 tooth gear, but somehow this one had a 156 tooth gear installed. Meade did replace the scope with a new one, and the owner is now thrilled with his scopes accuracy. It may have been a very rare one of a kind issue, but if you have a poorly performing LX90, It does not take a lot to remove the declination cover and check your tooth count.