If any backcountry skiing binding of the 1970s was a Jekyll and Hyde it was the Ramer model R. Lighter than just about anything else of the time. The first binding with a heel lift. Totally field maintainable. But in real-world the Ramer R had little if any effective safety release, required messy greasing, and if it did release the binding exploded apart and you needed a strong heart and hands of steel to snap it back together. Check out the museum display.