[ John A. Tuttle wrote in 120731 MMDigest:

> Has anyone ever drawn out a diagram of the 'around-the-action'
> tubing for the spoolbox portion of the Duo-Art grand system?

There are at least four different patterns of tubing to the junction
blocks, et cetera, for the different "around the action" Duo-Art
grands, just as there are that many different configurations for the
junction blocks.  My three "around the end" grands have three of those
blocks.  I have one of the fourth on my parts shelves.  The tubing
behind the spool box varies as well.

Geoffrey Kaiser (Tockhwock)