I have been using rifle/pistol graphite grease on my threads, but NOT on any connected to any optics.
Raymo, tried that, but the junction is too tight. No go. I would freeze it, IF it was not glued to the focal reducer (a scarce old Vixen one that sell aound $250, if/when you can find one).
Might try ethanol first then the boa. Acetone as last resort
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