Abstract: A disk operated mechanism having two pivotable members spaced apart by an amount less than the diameter of the disk. A lever extends from one pivotable member. Co-operable stops on each pivotable member restrict pivoting of the members when the lever is moved, thus restricting further movement of the lever. The arrangement ensures that a disk placed between the pivotable members will transmit force applied to one pivotable member by the lever to the other pivotable member to widen the spacing between the pivotable members so that the co-operable stops cannot contact each other to restrict pivoting of the members and thus movement of the lever.