"Ed Huntress" wrote:

"John Doe" wrote

Is there anything to know besides sticking the pipe through the
spring and bending it?

Are you talking about ductile copper? If so, that's all there is
to it.

Less than 1 inch diameter 6061 or "structural" aluminum from
McMaster-Carr. Seemed to work okay, I just wanted to avoid
crimping or weakening the pipe. It is shaped like the upper rear part
of a folding chair, an upside down U.