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Did you plan for the material and structural requirements when in use in your hinge?
You hammer gently while rolling the blank back and forth until the cross-section of the tube becomes somewhat pear-shaped, perhaps even a little bit teardrop-shaped.
Making Your Own Tubing
There are some hints for drawing thick-walled tubing.
This represents the minimum width of the blank required to make the tube.
Description: Again, for the larger sizes, wood, Delrin and homemade steel even unhardened drawplates will work.