While the valve cluster may held tightly, the bell is usually suspended (maybe touched with foam in one area). Does this leave the bell highly vulnerable for blunt force momentum shifts (e.g., horn + case heaved into a large bin). Seems to me that you would want some pretty rigid packing material (styrofoam) but only if the external shell is very rigid and strong (otherwise a crushed hard case causes a crushed bell with tight packing). Larry
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