Lay the white spandex sheet flat on the floor or table. Use the grommet pliers to add grommets to the outer perimeter at four-inch intervals.
Thread one rope through the grommets along each side of the spandex sheet. Tie knots in the rope around each of the sheet's corners. Test the knots by pulling the ropes taut. The spandex corners should stretch as desired, and the knots should hold it taut.
Assemble a frame from wood or PVC piping. Stretch the material to fit the screen. Secure the ropes to the frame. Stand the frame on the stage.
Position a light projecting device behind the screen. Point the lens at the screen's center. Activate the projector. Test the setup by positioning an actor or prop between the light and the screen. From the audience's position, the actor or prop should be pure shadow. Adjust the light source to sharpen or blur the silhouette.