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Crayford focusors
Could some one tell me why the crayford focusors have 2 screws under them? If I have the one closest to the OTA loose then the focusor will move in and out, if I have both of them loose then the focusor slips back down and if the one further away from the OTA is loose then the focusor dose not move at all? I don't understand it.
Cheers - Craig
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