Hello, fellow amateur builders and buskers!  My organ is almost complete
now; for the past couple of weeks I have been solving the final issues
(leaks, finishing, adjusting, tuning, etc.).  I have just updated the
web page with new construction pictures:

  http://members.cox.net/wmbusker/Uni26.shtml

But I have hit a problem: the middle melody pipe (C), second rank,
is not working properly.  The organ have four ranks of melody pipes,
13 pipes per rank, ordered from front to back: Stopped, Stopped Celeste,
Octave Open and Open flutes.

The troublesome pipe, when mounted alone, works well.  When mounted
with all other pipes, except the one directly in front of it, the pipe
works fine, too.  But when the first rank pipe is installed, the little
guy goes crazy: I am unable to tune it -- it goes directly from B to C#.

This pipe is surrounded by the Stopped C in front, Octave Open C at
back, and Stopped Celeste C# and D to left and right.  The pipes are
mounted 1" apart and 1-3/4" between ranks.  This leaves about 1/16"
side gap between the larger central pipes and about 3/8" gap to the
front and back.

I have partially solved the problem by raising the troublesome pipe by
about 1" and installing thin cardboard sheets between it and its
neighbors; I can tune it that way, but it is wavering around the C note,
and it sounds awful.  I have the same problem, to a lesser extent, with
the fourth rank C pipe (the open flute).  The first and third rank
pipes are working fine.

Does someone have a clue?  Is it the case of pipe "drawing"?  I would
appreciate any help, tip or guess.

Thank you,
Wagner Mello