An embarrassing thing .. my mute keeps falling out of my trumpet. The mute is relatively new, and is a combo straight/cup. I have a raw brass Harrelson (don't know if that matters). Last night during rehearsal it fell out during the middle of a piece (I cursed but luckily no one heard me during the fort part of a piece). I pushed it a bit too hard and one of the corks fell off. HELP please.