Update
Yet more issues
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The potentiometer 'base' just doesn't fit well into the board at all and whilst the circuit I've made works, it's all over the place unless I press down very very hard on the base. Basically the connection is wrong, it needs force to make it work. With force it works exactly as expected.
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I also discovered that the white leads in this mouser kit actually vary in length, this isn't terribly helpful when you're forced to rely on these because the supplied header pins are too short on the short side to work with the supplied servo
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oh and the servo isn't like the diagram in the book either. In the book circuit the leads are from the top down black, red, white, but on the supplied servo the order is different, black, white, red. Obviously this has circuit implications, using header pins as instructed would have reversed white and red.
This sort of "complete lack of combined QC" is seriously poor. And considering a whole bunch of further projects depend on these components, what, exactly, am I supposed to do now? Whose responsibility are these kits, Arduino or Mouser?