I'm just getting into airbrushing, and have the entry level Aztek airbrush. It did not take me long to see that their supplied tubing does not reach the bottom of the supplied bottles. (In an effort to get you to buy more of their bottled paints , I suppose?....) I want to cut my own tubes in order that they reach the bottom of the bottles. Anyone here know the size or gauge of those tubes that fit the bottle caps? Thanks in advance!