Thin-walled tube of soft metal when you try to bend often creased. To avoid this, they are usually pre-stuffed with sand.
With the same purpose, you can use another method: navit on the future site of bend copper or aluminum wire – turns will not allow the tube to wrinkle at the bend.
The same result can be achieved using a suitable inner diameter of the spring.
Recommend to read
VERTICAL GARDEN
The idea of vertical garden beds is not new, however this design is very reminiscent of a step-ladder, always a surprise even experienced gardeners. She designed the Moscow...
MITSUBISHI PAJERO
The first car with the name Pajero was released by MITSUBISHI more than a quarter century ago in 1981. It was a three-door car with a spar frame with torsion bar front and leaf spring...