Perhaps I might add a word or two on John Smith's reply to Bob Meyer's
comments.   The great advantage of the John Smith method of constructing
organ pipes is the ability to voice them easily "on the wind".  The
upper lip, or languid, is applied as a separate part of the front face
of the pipe, thus allowing you to slide it up and down before the glue
sets in order to find the "sweet spot" which gives best sound;
something that is hard to discover by conventional methods and
calculation of the cut-up.

I must confess to being won over to this method of pipe making.  After
many years of building traditional pipes with mouths of various kinds,
my latest MIDI-controlled fair organ will have several ranks of pipes
made with this method, including a double-bourdon Celeste rank.  The
results so far are excellent,  but no doubt the purists will tut-tut
even though the tonality of the pipes leaves little to be desired.

A number amateur organ builders and MIDster Punch builders from the USA
have visited my home and workshop.  From what they say, it appears that
the adhesive I use for applying these pipe caps and upper lips is not
available in the USA, but perhaps some of the readers will know
otherwise.   In the UK it is sold as Copydex and is primarily used for
sticking cloth, paper etc.  It is a white latex substance which dries
quickly to form a clear rubber-like film.

The joint it makes when sticking the upper lip to the pipe is very
firm, airtight and as permanent as you could wish.  But if the upper
lip has to be removed it can simply be taken off with a firm pull,
perhaps assisted with some leverage.  The residual glue can then be
rolled off with the fingers leaving the wood clean again. Pipe caps
can be removed in similar fashion although it does tend to destroy the
cardboard gasket used in the John Smith method of forming the pipe
throat.

I strongly recommend this type of adhesive for applied languids.
Perhaps someone knows its name in the USA.

Bob Essex
Warwickshire, England