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The steel cable and turnbuckle sound like a good idea. They would need to be strong though to deform the steel pipe the rollers are resting on, far enough so that its not going to spring back out after tensioning and removing the cable. I'm imagining that you don't want to leave anything permanent accross your dome.
Is it binding on the short axis or the long axis? IF on the short axis you may be able to rig up some sort of strut with a hydraulic car jack in the middle and push the short side out. I'm no engineer but that might help prevent spring back as you could put more pressure on the axis than using a turn buckle and cable which would have a certain amount of stretch in it.
Good luck with it. Hope you don't have to take it off. That doesn't sound like a pleasand task.
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