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Torsion spring resource wanted

I am going to build an arm to hold a tv that will hang from the ceiling. It will be approximately 52" for pivot to CG. As I am a teacher it will be an old fashion heavy CRT (prolly around a 25" tv)rather than cool wazoo light weight flat screen. I am looking for an appropriate torsion spring to take it from hanging to pinned up against the ceiling. I know about garage door springs but can't figure a way to retemper the spring after I cut off a few coils and bend an end so I can use it. Any ideas you may have to come up with a spring (canabalized is fine) or a retempering process would be appreciated! Thanks! Mikey

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