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Your thumbnail of the 'post vice' attached to a trolley shows how there is a bracket to attach it a bench or other fixed point, with the bottom of the post resting on the floor or other secure base.  Today, we are used to bench vices and vices that can  be clamped onto benches; even suction vices, with heavy rubber cups.  I have a suction vice which I place on a smooth worktop and rotate a lever that increases the size of the cavity in the rubber cup, thus creating a vacuum.   The vice stays secure enough for sawing and/or drilling what is held in the jaws.  As ever, Derelict Places increases my fields of knowledge.