 The rotor mast tilt was decreased and components shifted to ensure the center of gravity does not shift too far rearward as fuel is burned.The design requirements were 'frozen' in 2009–10 and not changed since.On 22 January 2010, Sikorsky opened a $20 million Precision Components Technology Center in Stratford, Connecticut, which shall produce CH-53K elements, such as the rotating and stationary swashplates, main and tail rotor hubs, and main rotor sleeves.