Everybody knows that for your diffuser (on the downstem) to work properly, it need to be tilted to make it vertical. However, now more and more bong are also using percolators with multiple arms and such. These should also be straight up and down for the best diffusion. So my question is- How is it that you would be able to have BOTH diffuse optimally? It seems that glassblowers only solution to this is to make inlines and other atypical(for lack of a better word) bong designs. Any thoughts?