I found a small bead in the the fount when replacing the leaking burner. Its diameter is about 6.5 mm and its height is slightly less, but more than 6 mm. The shape is hard to describe, but you might say it's like a fat UFO. I hope it is possible to see in the pics. It sticks to a fridge magnet, so it contains iron. What is it? I thought it might be some cleaning pellet from the manufacturing process, but why would the fount need cleaning?