Hello, I'm new to the trumpet, had it for 2 weeks, and love practicing. Its a Getzen 900 Classic. I'm getting familiar with the trumpet, checking how the valves and tuning slides work. I try to keep the horn clean and shiny. Everthing checks out (bought it used) but I cant seem to unscrew all three of the bottom valves. Do they even come off? I tried to unscrew them by hand and I am NOT going to use any tools to see if they do. I not too familiar trumpets, but is it standard to have removable bottom valve caps? They do have holes for water leakage, but it seems they would come off for better maintenance. I recieved the horn in near mint condition. The previous owner was a pro horn player in the Pheonix area and kept in good condition. It just needed some polishing and slide grease. Took it to a tech and said it was fine. So, do I need to force them open some how or are they fixed? Ruben S.