A method is disclosed which allows an invitee to a conference call, who is not present on at least part of the call, to have the call monitored in his or her absence. Specifically, the polyelectrolyte resins are polymers without hydrolyzable groups. These methods dynamically access, add, update, or remove dimension key values from any dimension or any group of dimensions while simultaneously enforcing the symmetry from all combinations of all dimensions and dimension groups. The two wedge-shaped tools are axially approaching to the plane while the rod-shaped workpiece is revolved around the axis. Thus, the described C-arm positioning device can allow a user to easily raise or lower the C-arm with relatively little effort.