I just finished retubing a Baldwin.  There are 89 nipples on the stack.
88 of them line up with pneumatics.  The very highest in the treble
does not.  That is the one used to supply the tracker system.

Good luck with the tubing guide rail.  There are holes in it, with
tubing going through three at a time.  However, some only hold two.
Others allow four or even five.  Use trial and error and it will work
out.

Jeff Davis in Seattle