Scratching inside the bell pipe
Well... I figured out the little protective bit on the end of my cleaning snake brush has come off. After bathing my trumpet.
So I assume I've scratched up the inside of the bell tubing where it does a 180 to go towards the valve block, at least a little bit. I did notice it wasn't going smoothly but didn't think much of it until cleaning the brush itself afterwards.
Obviously I feel like an idiot (I try to take good care of things, I really do), so please reassure me - the metal's thick enough that it isn't going to matter? Red rot doesn't start at scratches?
Thanks...