Hello, I've been interested in player pianos for over 50 years but
am still just a beginner!  I'm just completing a polished screw
restoration of a 1926 Weber Duo-Art Grand.  To help preserve rolls,
the systems described by Patrick Handscombe have, indeed, more than
"tweaked" my interest:-

  MMD 2000.11.14  Philipps Ducanola Roll Tracking System
  MMD 2002.07.10  Aeolian Tracker Bar With Extra Slots
  MMD 2008.10.21  Aeolian Roll Tracking System Valves

I would be most grateful if any readers could provide any additional
information and/or drawings, etc., that would help me duplicate such
a system.

Gary Crawford
Saanichton, British Columbia, Canada