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
ANTIMASONRY INSOLES
In the proposed padded insoles for shoes is nothing new, but... To the insole not "went" the shoes, cut they have a few larger native insoles with the edge at an angle of approximately...
FORM FOR RIVETS
Offer a simple way for the manufacture of rivets. You must take two of the steel area of any size, clamp in a vise and drill the desired diameter, drill out the holes and then...
