I think that this an occupational hazard. I've lost hair to most major makes of the old tin sandwich. You can't seal them up permanently or you couldn't clean them out. And then you would have to suffer that horrible moment on a harding sticking suck note when something unmentionable pings off the back of your throat and down your windpipe! But it's worth mentioning to other 'catters how much we suffer for our art.