I just bought a small Stanwell pipe and its stem is very narrow, even the smallest of my rubber bits don't fit it well. The fit is slightly loose, and so moisture will gather underneath them and making the rubber really slippery, thus difficult to clench. I really don't like having teeth marks on my pipe, so I'm wondering if there is a way to make the rubber tighter? Alternatively are there other ways to prevent teeth marks other than using rubber bits?