Abstract: A centering clamp which is particularly useful for clamping work pieces in jigs is disclosed.

Abstract: A lightweight component holding system which is simple to use, and in which an irregularly component may be readily positioned and repositioned for light assembly or inspection is disclosed. The system comprises: a side assembly having an elongated base having opposite ends and having; a carriage laterally slidable and lockable on the base, said carriage having; an upright column rotatably and lockably mounted on the carriage, said column having; a slide vertically and lockably slidable on the column, said slide having; an advancing shaft having a front projecting end having a component holding means attached thereto. At least three, and preferably four side assemblies have their opposite end portions interconnected so that they together form a stable planar component holding system, having a base center opening. In a preferred embodiment the advancing shaft comprises a holding means screw having a turning wheel on a rear end portion thereof.