To make sure your valves come back up after you press them down, manufacturers have furnished us with a set of springs which work very well for most of the time. Sometimes we are faced with valves which seem to hang up every so often and it usually happens at the worst time. Hesitant valves can be a real headache as I remember when I was in fifth grade and performing cornet solos with the Moline Boys Choir, of which I was a member. I had two solos to alternately perform in our concerts. It was usually when we had…