The Optical Tube Assembly or OTA was taken from my Meade LX200 Classic that I bought in the 1990's.The OTA optics are fine but the Meade Control System failed on more than one occasion. Details of the OTA are given in the LX200 Classic Instruction Manual here. It is attached by tube rings to the Paramount ME and I have a heating tape at the objective end of the tube connected to a DC 12V power supply to eliminate dewing. The major problem with this OTA is that it predates the focus lock added in later versions. Mirror flop makes automated imaging difficult as at certain positions the mirror will flop - making a bit of a mockery of the carefully centred images using T-Point. Using the focus knob also causes image shift which makes automated imaging difficult.
The LX200 mirrorI use a focus lock device to clamp the mirror fairly firmly - not tightly which prevents the mirror flop and has improved things considerably. I need to add an external focus mechanism to get around the image shift problem but have not done so as yet! The principle of operation of the device is described here.