Abstract: A workpiece is secured to a support or gang plate which is positioned at an acute angle relative to a base plate by a pair of hollow support blocks or cubes and corresponding angularly adjustable locator plates. The base plate, gang plate and support cubes have precision X-Y grid patterns of threaded holes and precision bores for use with a modular tooling system. Each locator plate is pivotally supported by a dowel or pivot pin projecting from the adjacent support cube and is precisely positioned by a selected gage block which contacts another dowel pin projecting from the adjacent support cube. Cap screws extend through arcuate slots within the locator plates and secure the locator plates to the corresponding support cubes after the gang plate and workpiece are positioned. The locator plates may be reversed on the pivot pins to provide for selecting smaller support angles.