Mountain climbers have been sleeping in hanging hammocks and tent like devices from the sides of cliffs for a very long time.
https://www.kickstarter.com/projects...k/posts/291280
Every once in a while someone comes up with a slight "improvement" on these systems. Also there are may variations and types of anchors used to attach these and other suspension systems to shear rock or cracks in the rock face. A "nut" is one of them.
METOLIUS - S.S. BOLT HANGER for $3.50 is one you can use in your house (wood stud or concrete block), on a tree, post or rock face it all depends on the fastener such as a SS lag screw.
http://www.backcountrygear.com/metol...g#.U-_SDFZtnwI
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