dalecue wrote:

have you tried dry ice on one end and a tourchor heat gun on the
other? old Indian trick



The heat on the outside will cause the metal to expand. It isn't a mind
reader. It can make the ID smaller. However cold on the outside will
shrink it, causing the ID to increase (you would have to agree to that,
right?). This is a school kids science experiment. When you see it work
with heat, it just losend it probably because of differential heating
and its affects and is erroniously attributed to the outside piece's ID
getting bigger, but didn't. So heat and cold does losen things, just not
like a lot of people think.

John