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How about the spring/shock devices that hold hoods and rear gates on cars? Those have rather long stroke and with an arm, can be positioned strategically to go over center. I'm making a dump bed out of mine, so wondering about a fold around wing, like a 929/817 dump truck. The spring...

Rusty, I talked to an engineer at a spring company and emailed him a link to your thread, since you show the simple torsion spring and gate setup with the hinge rod, quite clearly. We focused on having the arms at 180* (with about 10 ft/lb holding it shut) and I made some estimates of the...

Good work Rusty. I was sales manager of a spring co for one year after school and learned a lot about springs. I even had a patent being issued on bandsaw blades that used spring theory to go very thin and run at ultra high tension, but not break the blades...and proved it worked. The...