ED, Happy New Year! I remember you saying how your father (then later you) worked at the Schilke factory on Wabashâ€¦ so I thought you might be the perfect person to askâ€¦ I'm going to be vague, intentionally! I'm not really a techno-weenie so I'm surprised I even care... but, here it goes: Why is it so important to address the mouthpiece and receiver gap issue on all our instruments except the flugel and cornet?? These instruments do not appear to have a "receiver" that offer the ledge to receive the mouthpiece end, just an open pipe. I'm not new to this game of ours, but for some reason I'm rather consumed by this question. I do understand the taper issue with flugel pieces... so there is no need to address that. Without mentioning brand names, I recently switched cornet mouthpieces from one that has a very fine "edge" (very thin end) to another that uses a rather large edge (thick end). The thin makes sense to me... a small variance from mouthpiece to leadpipe (leader pipe for the Brits), with little drop (or ledge). Okay, I'm chops enough to admit that I've noticed no ill effects from this "ledge". But then again it's an entirely different mouthpiece too. I have read Schilke's explanation on the relationship of mouthpiece and leader pipe on instruments with "conventional receivers", but the cornet and flugel style of receivers is not addressed. Leader Pipe and Its Function Thanks in advance for a reply.