Apparatuses, methods, and systems are disclosed to detect and measure cracks in the lining of a container. In one exemplary method, a calendar interface is displayed on a display device, wherein the calendar interface is capable of displaying calendar events for a user, and a control interface is displayed, which control interface allows the user to selectively display calendar events simultaneously from at least two calendars of the user in the calendar interface. The golf club head is tuned by changing the viscosity of the rheological fluid. If the error condition exists, the controller oscillates a rotor to the motor between a first and a second position. The invention also relates to a system and an apparatus for carrying out the method. The U-shaped bars maybe of tubular construction and have a flat surface and are preferably angled from the side bar at an angle of approximately 45 degrees and each U-shaped bar has end portions that meet the center bar at an angle of approximately 0 to 45 degrees.