I just got a brand new Yamaha YTR-2335 student trumpet. It came with a new 11B4 mouthpiece, which I love and find that I prefer over the Bach 7C that I had b4, the 11B4 is equivalent to a 7D I guess. Anyway, when I insert the mouthpiece, it hits a point where it can't go in any farther, (I think it's hitting the lead pipe) but it's still loose and needs to go in more. I think the mouthpiece taper doesn't start soon enough or maybe is too long. Now, here's the funny thing, the mouthpiece fell out last night and hit the hardwood floor and put a little dent in the mp where it inserts into the trumpet. Now the mp goes in as far as it did b4 but now it fits snuggly because of the dent. It works fine now but I want to know y it would do that in the first place?