16 similar to that of the embodiments shown in fig2 and 3 alternatively a guide similar to that shown in fig4 a and 4b but made in two parts may be used the base 46 being glued onto the test fixture 10 and the cone 51 being attached to the base by means of a screw or similar device through the offset hole 48 fig5 shows a printed circuit board 52 ready to be guided into position so that the tooling holes 54 pass over the tooling guide pins 14 if there is any lateral error in the initial positioning of the board the slope of the conical portion 20 of the guide 16 causes the board 52 to be moved laterally into the correct position because there are guides on all four sides of the board any lateral positioning error can be corrected further the presence of guides 16 on each side of the board 52 together with the force exerted by gravity on the board tends to correct any rotation of the board 52 about any of its three rotational axes away from the plane of the testing location 12 therefore by the time the board 52 reaches the tops of the guide pins 16 it is laterally positioned so that the guide pins 16 connect with the tooling holes 54 and is substantially horizontal to the plane of the testing location 12 so that it travels freely over the vertical guide pins 16 additional advantages and modifications will be readily apparent to those skilled in the art the invention in its broader aspects is therefore not limited to the.