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Try posting this question on the www.cloudynights.com FORUM, either in the REFLECTORS topic, and or ATM, Optics Topic.
Someone will answer you with the exact dimensions You can also post a Free Classified ad there -- a WANTED ad looking for the entire missing top section, Meade "may" also be willing to sell you this. www.meade.com.
Check the autostar controller; you may have a stuck key. The telescope should run without the control - unplug it after it starts and see if the slewing halts. (don't plug it back in while powered) The other thing, would be a bad sensor on the motor.
The ETX family (and other Meade LX telescopes), use a moving mirror system for focus. The focus knob moves the main mirror in and out. For smooth operation, there is some slack on the central tube that allows the mirror to rock slightly as it moves. That is a normal condition, and the movement is magnified, the greater the magnification of the eyepiece.