I have a vintage Omas Lucens pen from the late 1930s, or so. A bit of ink was seeping from the area where the section meets the body of the pen. Now this is
an old celluloid pen so I was very gentle. I tested to see if the section unscrewed at all. It did with minimal pressure. So I unscrewed it a bit more, not entirely
just a little over about the half way mark. I then applied a little bit of 100% pure silicone grease to the exposed threads. I used grease that I bought from Richard Binder years ago.
I screwed the section back into place and the leak was solved.

But then I wondered if the silicone grease was the best produce for the old celluloid pen.

Any advice would be appreciated, thank you