The included "tool" is functioning properly.
When re-pressing the knob clean should be a ca a millimeter air and do not press the knob all the way up to the plate down, otherwise it rubs when turning.
The extinguisher in the plate are relatively wide cut. They can therefore easily put the machine on it. fits perfectly .... only is unstable, which means that the plate can slide back and forth minimal. This could cause you to chafing said underlying cover ... that would be very annoying.