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The Teflon grease works well too. I wipe a small amount on and wipe it off so it really only leaves the tiniest of grease. I notice now you can get WD40 cans with dry graphite lubricant. That may be worth checking out as well. I am wary of using any grease as they may outgas and who knows if that could damage CCDs or optics/coatings.
This is obviously a common problem we have all had at some point. At one stage I thought I had to destroy a 2.7 inch Tak reducer because it was so stuck on. Luckily several WD40's eventually freed it up. Tak are definitely the worst. AP is the best, never had an AP adapter stick. Tak uses finer threads plus their coatings are very dry and they coat the threads as well as the main body. Imperial threads seem less prone. They must be coarser.
Greg.
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