Heres how I would keep it running. First glue the ear back in place to hold it in location. drill the hole thru the bench. cut a piece of pip close to the radius above the ear. notch one end to fit around the ear and the other angled from level to 1/4" under the top surface, A long bolt and big washer ( may take a smaller ne also to cover hoe in big washer) and bolt down with high side of pipe away from press. The glued ear will stop rock on down stroke. Te pope and washers act as a strap clamp and lock the press down securely.