I'm with Freebeard on this. Hinged at the top, bungied at the bottom. Totally passive system, no user interference required to make it work.
HDPE wear pads at the extremes. Or what the heck, pine. If it only has to resist the downforce of the bungie and not the entire weight of the car, wooden rubbing blocks will do.
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Lead or follow. Either is fine.
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