A while ago this subject of bending a 3/8" copper tube was discussed in
In this case filling it with salt is not an option as the tube comes in 50cm
dia coil so it would be difficult to compact the salt. By straitening it it
would harden and etc.
For $13.50 I got hold of a "bending spring". Pull it over the tube and do
your bending stuff :-) no problems or collapses at all. So I just finished
and have a spare spring.
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