I'd recently purchased a 750mm 6" Newtonian on an EQ mount. The mount's gears began to grind soon after setting up. I took the mount back to the store twice - the replacement had the same issue. The third seemed ok. Leaving the store, I got booked for parking in a no standing zone, and when I got home, I noticed the pin which locks the angle was jammed (luckily at the right elevation for Sydney - around 34 degrees). I was so upset about the parking ticket and having to return twice before, I let it slide. Hope to one day be able to fix the pin myself.
Oh I D'oh'd! And often that day.
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