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Hello everyone, I've been working on a few stainless steel (ss) watch cases and I've encountered problems with screwing the case back off and on (even after cleaning). The problem seems to be that the dry threads which may have been abused in the past have that crunchy gritty feel when opening/closing and are difficult to get started. I accidently got a blob of silicone onto the threads (from the o-ring) and noticed that this really helped, so I then tried a very small smear of lithium grease I had kicking about directly to the threads and all the threads I tried it on were smooth as butter. Then I started thinking back to my engineer training days in Sunny Montrose in Scotland and we used copaslip (see below) on the threads of oilfield service tools, and was pondering if this was a better idea for the threads than the lithium grease as this is what it is designed for. does anyone use anything better or have any better ideas, what do you use, if anything?