I took a chinese piccolo trumpet in to the local repair shop because the second valve sticks when held down for a moment. Told and showed the repair man the problem yet when I got it home to play it , the problem was still there. I called the repair man and he was rude, even accused me of dropping the horn on the way home. Really? I called the owner of the shop and told him I was done doing business with his store. Is there a way I can try to make the valve return faster. I have tried all of the expensive oils and they did not help.