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.
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When performing masonry great aesthetic importance is the jointing. Use to perform this operation cut tube Ø 10— 12 mm by bending it as shown in the figure.