I have never disassembled this mount, but it has been in the past as there are red LED's near the RA and DEC levers, you turn them on at night and in dark skies it makes it easirer to find the levers. As for problems, I have had none, I aligned the scope to south and tracking worked correctly - not to sure how to measure backlash. I am not experienced enough with this type of mount to judge whether it is OK astrophotography, but I know it is OK for visual use.
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