I've got one, and a few years ago I accidentally turned the dial up past the maximum (I shouldn't have been able to do that).I have a Kenwood chef and its magnificent. Practical, easy to clean and the all stainless steel machine looks the part
It wouldn't go back again, so it was useless, as it would only run at maximum speed, and had to be turned on and off at the socket.
I contacted Kenwood CS severl times and got no response whatsoever
After a few years of un-use, and as I had nothing to lose, I managed to force the speed knob back. It was then usable again, so I offered it to OH. But she enjoys making pastry by hand and didn't have enough room on her worktop to keep it out, and nowhere to store it.
So all in all, it hasn't been used for about 15 years.
I originally bought it for my wife about 40 years ago from Timothy Whites and Taylors - - - anyone remember them?