How do you hold your cornet? Do you think there's a "right way", or do you just find what works for you? I take the weight entirely in my left hand, fourth finger and pinky under the third valve slide, middle finger through the third valve ring, index finger and thumb round valve casing. That way the centre of gravity of the instrument is above my fourth finger, and I don't have to grip hard. And I can throw the third valve slide without changing the position of my other fingers. This leaves my right hand free - I don't have to claw my hand to grip the instrument and my fingers are nice and relaxed.