I finally managed to solve the problem of getting a really durable flight case for my prized vintage Conn New Wonder II ("Chu") tenor with this Gator Deluxe ABS case which to my surprise accommodates the opposing bell keys. That's always the big question with these shaped cases. In fact there is a bit of extra room lengthwise so that I think I will add a piece of material to the top of the end plug to make things nice and stable. The case closes without any hint of it being too small and when I shake the case, I can't detect any movement of the instrument inside. That's what you want so that in case of major impact, the instrument is not damaged by the inertia of movement inside its case.