Perhaps the mechanism is not so simple.

Karl the Landgrave is on record as saying that the secret of the wheel was so simple a carpenter's apprentice could make one, if he was allowed a little time to study it.

In the eighteenth century skilled  craftsmen traditionally employed children from a young age, 12 or 13 usually, but sometimes as young as 7.  They were indentured in a legal document  which bound the child to the master for seven years or more.  He provided board and lodging in return for free labour and also provided skill training which would ultimately permit the apprentice, upon leaving his master's employment, to set up on his own in a similar craft. So in Germany at that time the freed apprentice would usually have acquired all the necessary skills to operate successfully, by the age of about 21.

I think that Karl's words might have given the impression that the skill required to reproduce Bessler's wheel was scarcely higher than that possessed by the ordinary person in the street.  He was a ruler, a statesman and a politician and therefore commented in front of others of a similar standing, and chose his words carefully, knowing they would probably be reported by visiting dignitaries. 

I think he would have responded to questions about Bessler's wheel as noncommittally as possible and when asked how complicated the wheel was, would have considered his response in his customarily careful manner.  So, he chose to use an apprentice as an example, that being of less experience than a freed carpenter; less experience but still with four or five years expertise to back him in his  in attempt to copy the wheel.

I saw a documentary on child labour recently, and the skill demonstrated by kids as young as nine or ten in assembling electrical items, polishing gems, extracting precious metals from scrap electronics was eye-opening.  I see no reason to support the notion that, just because Karl appeared to be slightly denigrating about how simple the mechanisms were, should not fool us into thinking the secret to assembling Bessler's wheel would be easy and not involved complex configurations.

I mention this again, because my problem in assembling the parts I've made for Bessler's wheel are difficult to arrange without accidental clashes between different components.  But gradually by rearranging them over and over, I am getting there.

JC

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