This cord is string like and treated with tar for longevity.
It is an older style fixing for tying the base layers of thatch to the rafters/battens.
A term used to describe the ridge line between two different heights of ridge.
As its name suggests, this metal pin is used to hold the set (bundles in a row) on the roof, while the fixings are being attached.
Nothing to do with cops and robbers!. A crook is a metal pin hammered into the rafters as a fixing for thatch.
Older style fixing – superceded by stainless steel screws and wires nowadays.