Abstract: This application discloses a device for mounting a lens between friction pads on the inner ends of coaxial rotatable shafts of a lens edge grinding machine. The device comprises a base which can be adhesively secured to one face of the lens, after removal of a protective peel-off strip which lightly adheres to a layer of adhesive on said base, and a key projecting from the back of said base. Said key is received in a keyway in one of said friction pads to locate the lens angularly in relation to said shafts. This friction pad engages the lens surface around said base so that the rotational drive is transmitted from the shaft to the lens direct from the friction pad surface and not through the key.