hey all! i've been teaching a little girl cornet for a few months now, but she seems to be having problems with her 1st valve. Its a JP cornet (never played one myself, but its a basic beginners one) which she was given by her youth band, and the 1st valve sticks regularly. Its not just slow to come back up, she has to stop playing and lift the valve back up. It is not the way she holds the cornet, as she presses the vavles straight down, and we have tried washing the cornet, and obviously using valve oil, but its not helping. Other than this, the cornet seems fine, she's making a nice sound, and has got a good range, so this is holding her back a bit. any ideas anyone? is it just a bad cornet design or can i do something about it for her?!