In the local woods that I have been testing out my hammock there is a rockface.

Seeing this reminded me of a picture I saw once of somebody hanging between a rock and a tree so I wondered about adding some nuts to my setup as a backup. (nuts are aluminium wedges on wires that you place into cracks)

I have some nuts so carrying a couple would not be too much of a hassle but I remebered something about the history of climbing which I thought might be of use to non climbing hammockers.
The reason nuts are so called is because the first climbers to use them made them from machine nuts with the threads drilled out and thin webbing tied through them. I was thinking having a couple of drilled nuts and spectra might be a usefull bit of emergency hanging kit.