This is qualitatively quite disappointing, there's even such a thing did not occur with the cheapest no-name stirrers.
On the positive to note that the kneading hooks do not rust, which unfortunately was the case with our early favorable Philips device.
On the device is a sticker with a stirrer and the indication for 50 years.
What will we Bosch saying? Bosch is only 12 months warranty :)