Hi,  Let me make a suggestion about tuning the calliope.  _Do not_
just bash the tuning plug up and down.  Consider where the force will
go.  If you hit the top of a frozen pipe (either up or down), it will
tend to stress all the joints at the bottom of the pipe.

It would be better to remove the pipe from the calliope and then use
the slide hammer while holding the pipe body stationary.  With large
pipes the body could just be held by hand because the mass of the pipe
is large.  With smaller pipes, wrap with leather (or something similar)
and hold the body in a vice.

It wouldn't hurt to apply something like WD-40 or light oil around
the inside of the pipe to help break the plug loose.  Once the plug is
moving, you can return the pipe to the chest and tune it.

Regards
Craig Smith

 [ In the 1950s and '60s I operated and repaired air calliopes for
 [ Orval Cooper of Long Beach, Calif.  He taught me how to build
 [ whistles (they were frequently missing).  Cooper said tuning wasn't
 [ usually needed except after repairing a whistle.  He also said
 [ that if a joint broke while using the slide hammer it would
 [ probably break soon just from the vibration of transporting, and
 [ so it should be re-soldered anyhow.  I can't recall that I ever
 [ encountered a frozen brass tuning plug.  -- Robbie