Making a tracker bar of acrylic plastic is a good alternative solution
if you have an accurate drill press and a compound table.  I made the
tracker bar for my Wurlitzer 105 band organ the same way -- by drilling
the holes -- but I used a piece of solid brass, which is more stable
than plastic.

I first drilled the holes for the front row, then the holes for the
hose connectors, and finally a row of holes at right angle to connect
the holes of front and back side, which I then closed with small brass
bolts.  I sent photos to show that this method works well too.

Best regards,
Christian Wittmann
Wolfsgraben, Austria
christian.wittmann@tele2.at.geentroep [delete ".geentroep" to reply]
http://www.drehorgelmusik.net/ 

 [ Thanks, Christian, I'll place the photos at the MMD Pictures site,
 [ http://www.mmdigest.com/Gallery/Pictures/index.html
 [
 [ A nice article about Christian, in English, is at
 [ http://www.ima.or.at/klangmaschinen/db/db.php?table=Place&id=8&lang=en 
 [ and a photo of Christian at the keyboard(!) of the Wurlitzer 105 is at
 [ http://www.ima.or.at/ff_klangmaschinen/db/data/221.jpg  Be sure to
 [ visit Christian's web site, http://www.drehorgelmusik.net/  -- Robbie