I have a copy of a Welte-Mignon T-98 Service Manual in German and had
it translated to English a few years ago.  I would be glad to share
this manual with Skip Downing or any other parties seriously interested
in rebuilding a "Green" Welte-Mignon system.  The layout of the tracker
bar can be found in a couple of the excellent books by Art Reblitz,
although I don't remember exactly which ones at this moment.  I do not
have a tubing diagram or schematic.  Good luck.

Mike Kukral
Terre Haute, Indiana