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I have a question about a swing I'm trying to make for my dad and I needed to know what type of material (metal) is optimum and the best way to go about this.

Basic Layout

I know I want the seat to be supported by a pipe that can retract. The swing itself would need to be strong enough to hold up to 500lbs (incase mom wants in, not that he's that fat). The pipe would retract inward and outward mechanically and the length fully retracted would need to go out about 3-4 feet.

So I'm thinking this would be like a pipe inside of a pipe, inside of a pipe kind of thing that would push the other pipe out when the swing reached the end of the last.

Questions

What would be the best metal pipe to work with something like that (support up to 500lbs)?

How would I keep each pipe from popping out the other without restricting the movement?

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    A diagram of your proposal, and a description of what you're trying to achieve with this project, might be helpful. – Tester101 Nov 25 '14 at 16:07

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