This is a very common concern for many young players and the solution is very simple. If your instrument was working before you oiled your valves and then after oiling them your instrument will not allow any air to be blown through it, you either have one or more of your valves in the wrong valve casing or your valves are incorrectly positioned in its own valve casing. Solution to your problem- Check to see if your valves are in the correct valve casing- Check on each of your valves for a stamped number. Usually they can be found on…