Hi Housewife, This was the hardest part of the game for me. Don't turn the round wheels. You have to turn 4 of those arrows to reach the bottom. Then use it once when you get down there. You use that extending arm to zero in on the arrow you want to turn, a white light will come on when your in the right position. Then turn the knob to turn the arrow. On the way back up you have to turn those same arrows back to their origanal position.
Spoiler
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Turn the 1st, 2nd, 4th and 6th arrow.
Good Luck