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A pair I bought for parts to fix my own Bins where just badly aligned. The thread on one of the objective assemblies was cross threaded. I fixed them instead with a few bits from my old bins because they were (other than the broken focusser screw) better than mine.
They are now my current best astro 12 x 50 Zeniths with some light sheilds on the front. They have a flatter field than my 10 x 50 Olympus bins.
Took a bit of CRC and some determined pressure to free the jammed thread but once I got it right it screwed in perfectly. Check to see if there is a wee gap (< 1mm) between the body and the front objective lens assembly on one side. That was my clue as what was wrong.
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