Hello,  Vic Searle's mention of his use of double stick tape for
pneumatics is most interesting.  One thing that must be considered
is the tape used.  Today there are all sorts of double stick tape,
ranging in quality from total garbage designed to hold a worthless
piece of junk together long enough for you to decide to throw it out,
to industrial versions that will outlast whatever you stick them on.

I recently purchased some 3M double stick acrylic VHB tape at a very
good price -- I bought about $1000 worth for less than $100.  We
recently had a minor accident with our new Honda Ridgeline.  It tapped
a pole at about 2 MPH.  The bumper deflected and crushed the Styrofoam
that "acts as a shock absorber" and pushed off the trim pad on top of
the "bumper".

While waiting for the new piece of plastic to cover the "bumper",
I carved away the excess Styrofoam with a saw and temporarily stuck
the plastic on with my double stick tape.  The plastic piece is under
tension because it had to be flexed to fit the slightly distorted
"bumper", but the tape is still holding firmly after winter rains,
cold, loading and unloading furniture, etc., etc.  It will probably
outlast the car and the new part may never be used.  In the dash of the
same (not cheap) "truck" there is a rubber liner held on with double
stick tape.  Dusting this little rubber bin out caused the tape to
part.  I guess Honda did not use 3M VHB acrylic foam tape.

Would there be any mechanical musical instruments today if they were
built as well as a Honda?  Still, I would not use tape for pneumatics
but it is tempting.  There are tapes that are approved for overhead
installation of glass in public places. Not all tape is equal.

Best regards,
Spencer Chase