Abstract: A method is disclosed for assembling components on printed cards with the use of a position-locating aid. This position-locating aid preferably comprises a display system which indicates receiving holes in the card for connection wires of particular components to be mounted according to a predetermined mounting program. A line or lines consisting of points of light are projected between the receiving holes. The line or lines form a plan or symbol representing the particular type of component to be mounted. The plan or symbol is repeatedly projected at a sufficient frequency so that a fixed image appears to a viewer who is assembling the components.