I'd listen to Don at Bintel. Given the scope is circa 90 I'd say it's a matched set so be very careful with the corrector and do not overtighten it when you put it back. Just touch pressure on the retaining ring and set them back in a star pattern when you secure it. 12 o'clock, then 6, then 9 then 3, then 10 then 5, then 2 then 8, you get the idea.
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