Mine had all of those issues and has taken mush time to repair albeit I did it myself, made improvements so it wouldn't happen again, and saved spending more $$ on a scope that should have been designed better from the start! People who pay several hundred $$ or more for these used on eBay are crazy! Only do that if it's in pristine, guaranteed working condition. All those issues will cause bad tracking or inaccurate auto-star finder. That's also a good time to check for broken gear teeth, split screw anchors in the ba se assembly, end play in the worm drive, and so on. The wires fray or sever and the entire scope base needs disassembled and depth of repair depends how badly the wires are damaged. Worse yet is when the 4 wires that run through the partially hollow RA locking bolt. Fix is easy if you know what you are doing to repair it. Most common failure is the broken Declination locking knob since it's plastic and snaps. Still they suffer from drive mechanism failures of different sorts. The latter three are Muskatov design and much better optically and made in the USA. All ETX models are not equal, by far! The ETX 60, 70,80 are refractor types and built cheaper than the larger objective ETX 90, 105, 125 models. The ETX line is a good line of amateur scopes. Optically pretty decent - mechanical reliability/accuracy is questionable
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