A large bolt with a round head, used for fixing wooden panels to masonry or to one another.
- Floor, walls and roof were made from laminated timber elements 625 mm wide and 140 mm thick, which are fixed together with coach bolts and stainless-steel pins.
- The rectangular top frame slots together and the legs bolt on with the cadmium-plated coach bolts provided.
- The original threaded bolt was replaced with a retaining pin made from a long coach bolt with the thread cut off.
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