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
HACKSAW-THE DUO
Friends gave me a small bench set in wooden box, the kit which included the hacksaw with custom shortened paintings. When they are worn out, replacing them is not found. Helped me an...
SIGNALLER ICING
The formation of ice on the surface of the blades of the rotor (screw) microgenerator-ROV, wind turbines, anemometers, propeller vanes, fans, degrades performance and may lead to...