I'm a few weeks away from buying a new single-wide garage door, manually operated. Stopped into a showroom yesterday when I didn't really have enough time to talk for long with the guy. He pointed out a type of spring system I'd never seen: A coil wound around a shaft, with the whole assembly installed along the wall above the door opening. He said "Somewhat more even lift compared to the springs you're accustomed to, but probably not worth the $28 difference unless you're getting an electric opener...". Then his phone rang, and one of his installers walked in with a clipboard and a question. It was 10 minutes before closing time, and I decided to stop back earlier next time.
Any thoughts on this type of spring?