Hi all, A friend has a upright piano with the Simplex player mechanism.
A part in the tracker mechanism broke and then she lost the pieces!
I want to find a replacement or make one so I need some advice.  This
mechanism is pictured in Art Reblitz's book, "Player Piano Servicing
and Rebuilding", page 138, and I will refer to it with my questions.

From her description the piece appears to be a round flat wooden
disc that fits inside the hollow friction wheel.  It may be what is
described as the pinion centering plate.  The right end of the pinion
shaft apparently fits into a small hole in the center of this disc and
positions the wooden pinion bar so that it can slip around on the left
face of the friction wheel.

Also inside the friction wheel, behind or to the right of the missing
wooden disc, are two thin brass pieces which apparently are to be
positioned so that a hole in each of them lines up with a hole in the
center of the friction wheel.

One of these brass pieces lies across a little coil spring, which is
recessed into the inside flat face of the friction wheel.  Also, this
hole in the center of the friction wheel is in line (to the right end
of the pinion shaft) but it appears that the right end of this shaft
is not long enough to extend beyond the pinion bar, through the missing
pinion centering plate, through the two brass pieces and into the
friction wheel hole.

Therefore, does the pinion centering plate have a short stud on the
rear face that centers it into the friction wheel, or am I mistaken
and the right end of the pinion shaft is really long enough to reach
through the pinion centering plate?

I have taken a picture of the assembly if that would be of any help
in further identifying the missing piece and how it goes together.
Any help would be appreciated!

Thanks from really frozen, again and again, Northeast Indiana,

Pat DeWitt