What I failed to do was to take apart the two white and steel rollers - one of which can be seen here - to get at the sensor in the middle, which was where the trouble seemed to be.
My impression, from looking at the shredders in the shops, was that they are all, certainly the domestic ones, built on much the same lines. Perhaps all the shredder rollers in the world are produced by two or three factories in a speciality village somewhere in China. I have certainly read about such concentration of component manufacture at least once.
From where I associate to the elaborate networks of distribution and production built up across Europe over the last thirty years or so on the back of the free market - which the brexiteers are gaily trashing. Perhaps they never knew that the might of 20th century Germany was built on the customs union of the component states in the 19th century. Or that the power of Napoleon was built on the dismantling of the feudal dues, tolls, taxes and customs which tied down the commerce of pre-revolutionary France. Ditto United States.
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