Question

About repairing Thetford c-400 holding tank: Can I simply remove circular plate (no. 5/5A in spare parts drawing) by twisting it left or right? I do not dare to take a chance because that might damage the original sealing or other parts. Regards, Wim AB

Answer

To remove the blade mechanism you turn it anti clockwise about a quarter of a turn, it will then lift out. This should not cause any damage but it is quite tight.