Phil, You need to cut off the tubing and then soak the tracker bar
and what's left of the lead tubing in denatured alcohol.  I now use
a PVC tube cut long enough for a reproducer tracker.  I permanently
stuck a cap on one end and I put another removable cap on the other
end.  Put the tracker in the PVC tube and fill the tube with alcohol.
Cap it up, put it outside for the night and go about your business.

At best, the next day you can grab the lead tubing ends and pull
them off.  At worst, you may only be able to brush and scrape excess
shellac.  If that's the case, repeat the soak and do it again.

To remove stubborn lead, I slice the lead lengthwise through to the
copper.  I then separate the split and it becomes easy to remove.
You can use a fair amount of force as you split because the copper
tubing is much stronger than the lead around it.  Brush off the
leftover shellac, maybe soak it again and you're ready to use rubber
tubing.

By the way, I use this same PVC tube when I remove tracker tubing
on Aeolians, except I use gasoline.  Definitely let it soak outdoors.
I remember from high school chemistry class that only a cup of gasoline
that evaporates in a garage can explode with disaster with even a spark
from a light switch.  Be careful!

I read somewhere that the people at Ampico would make burnt shellac and
then add saw dust from the shop floor to make tubing sealer.

Jeff Davis - in balmy Seattle, Wash.