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How nice would it be if you did not have to re-cut and re-seal the "some kind of sealer" for every adjustment? If the mating surfaces had "pipe grade" interiors and exteriors, you might be able to use silicone-slicked o-rings or similar gaskets for that purpose.  Dont laugh, but some sewer pipes (and water pipes) are quite thick-walled, and some even come with a belled end and a narrow end, with gaskets pre-fitted in the belled end.  Typically, caps are also available, and you might even pre-work a cap's threads in order to gain a range of adjustment to eff with the interior volume.  Again, just use silicone grease to dope the threads. Some of the pipe systems include special flanges that can be used to mate a pipe end to a flat surface (eg, the horn).

Best regards,
Paul S

Rerurn to Romy the Cat's Site