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There are two different threads used for the back plate on SCT's and Maks depending where they come from The Bintel crayford is slightly smaller than many of the "cheap" OTA's and won't screw on more than a couple of threads.
I could not get the back plate off my OTA to put it in the lathe to recut the thread so I opened out the thread on the Crayford instead.
Barry
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