Some original instruments could be disassembled into the constituent straight tubes, bowed tubes, bell flare, and stays, with ferrules at the joints. Mersenne has a diagram. (Little imagination is needed to see how it could be reassembled—with an extra tube—into something approaching a natural trumpet.) There is a debate as to whether they used tight fittings, wax or another joining substance. Modern sackbut reproductions are usually soldered together. Some modern sackbut reproductions use glue as a compromise to give a loose fitting for high resonance without risk of falling apart.