Re: stem prob?
I'd rather upgrade my vase before I cut into the stem, especially on a pipe that small. Measure up the stem and grommet and look into something like a small Sahara vase you can get some very interesting vases and are relatively cheap.
36" Al Falkher Solid - 36" KM Copper Heart Two Hose - 22" Temsah Mini-Wheat(a.k.a. Golden Nugget)