Probably been done before and I haven't looked this up yet but could a knife fold horizontally instead of the usual vertical slip joint method and be kept open by a strong magnet and still be a UK EDC?
It would fold, be under 3 inches and would no more lock than a really tight slip type joint? The magnet could be just strong enough but still allow closure without any secondary action?
It would fold, be under 3 inches and would no more lock than a really tight slip type joint? The magnet could be just strong enough but still allow closure without any secondary action?