A device for applying a non-circular adhesive label to a non-circular optical disc includes a base having an axial opening therein and a platform surrounding the opening for supporting the non-circular label. During thermal testing, the test block is mounted between a test head and a test socket such that the rails provide a thermal path between the test block body and contact pads formed on the test socket. The field windings alternately have a supply voltage applied thereto via an actuation unit in order to obtain an advancing motor rotating field.