The solution must be checked and rechecked.
Try that solution again carefully and see - as stated below it must be done accurately
Witchen wrote in her walkthrough
You have to rotate the spindles accurately in order to get the correct message to spell out: D I E G O This puzzle is more complex in the Senior Detective mode, with a wider variety of turning spindle options. But, the principle is the same. Just keep turning and changing which spindles you turn, until you get DIEGO to appear in the right order.