crowmadic

When the valves on a Bb trumpet are perfectly aligned, and you look into the portals of the middle valve casing, what should you see when the valve is up, and when it's down? When it's up should the upper portal be perfectly alighned with the valve hole, or only partcially, and should the bottom portal be totally blocked by the valve wall or not? This question refers to virticle as well as lateral alignment. And while your at it, if you are, does this apply to all ports and valve holes?......................tom