Pulp is obviously talking about the fixed tip Trompo Grande. I believe he has some tips for sale (in Europe.) Spintastics now has Salvador's tips so you can order directly from them. And if you also want some of the Mexican tops, I do have a few tips left I can include
For the Trompo Bearing there are not many performance mods, unless you count cleaning the bearings and lately they already come clean. Mods for the TB are more about looks: adding a light or painting and dyeing the clear body. By the way, I came up with a color variation of the stationary vertical stripes and also a way of having a drawing (e.g. a name) to show on the side while it spins, but I need a new camera with manual control of the shutter before I can post pictures.