I recently replaced the water pump, thermostat, and hoses on a 2000 ML320. In doing so I clumsily broke the collant temp sensor. I pulled the clip from around the sensor, but the sensor is very difficult to remove. I am afraid of pulling on it too hard and breaking off more to the point that I would not be able to get any leverage on it. How is this thing supposed to come out?

Thanks in advance.