Micheal La asks about replacing lead tubing.  For what it is worth, I
can strongly recommend that, if the tracker bar tubing is not overly or
obviously corroded, then do not touch it.

I was able some years ago to get some tracker bar tubing extruded on a
Pirelli hot-lead extruder using lead alloy E.  I don't have any of that
left, and I only used it to repair the odd piece of damaged tubing.
Lead tubing is likely to be extruded as an alloy, and due to its age,
it is very unlikely that anyone would be able to judge the lead quality
by touch or feel.

Also, the inside diameter of the lead tubing is likely to be smaller
than any replacement rubber tubing, and the use of a larger diameter
will result in more air to be evacuated from the tubing when a note is
playing.  This is the wrong direction to go in.  Responsiveness needs
less air volume, not more.

The attachment of the lead tubing to the tracker bar at one end, and
the attachment to the wind chest at the other, is sealed with burnt
shellac.  At least it is on my Autopiano.  To start removing all this
material is going to result in a stuffed up wind chest cover, and a
stuffed up tracker bar.  The wind chest cover and the tracker bar would
need to be removed as an assembly.

What needs to be done is to blow out any lead oxide corrosion from the
inside of the tubing.  Use of a small "pull through" is suggested if
there is a lot of oxide deposit.

Other MMDers might have more to add here, because I have never
encountered corroded lead tubing on any pianola I have seen in
Australia.

Paul Rumpf