I followed the guidance in either Givens' or Reblitz' books as far as
lead tubing.  If you blow air through it and no tell-tale white dust
comes out the other end, leave it alone.  I had only a couple of tubes
to patch on the tracker-pneumatic side of the Autopiano action of my
ca. 1919 TriumphAuto player piano.  The tubing is as bright and shiny
as new.

Bill McKeown