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Sort some decent stst long fine bolts and nuts (w washers) to replace the rivet-type ‘hinges’ a lot of the camp chairs and tables use. I’ve replaced a few and had years more life out of them

Add a layer of 15mm closed cell foam beneath the foam (as above), and I swear it’ll be as comfy as your bed at home

A Thermette is a neat way of quickly boiling a decent volume of water for a brew...