I can't believe I've never thought of this. At this link:
The artist says to use salt in copper tube when bending to keep from
kinking. I've done the sand trick and it works. Got that one from
"Flight of the Phoenix" when I saw it in a theater when it first came
out years and years ago. But sand and salt should work the same and
salt is easier to get completely out.
Eric R Snow
15 years ago