Bought a 6" Argos oscillating fan about 12 months ago, to replace one which had failed, as part of our dehumidifier / fan combination for drying clothes in the utility. It stopped worrking last week, so I took it down to have a better look at on the bench. I then found the flex, which exited the motor, via the pivoting mechanism hole, neatly chopped in two by the osccillating mechanism arm.
Brilliant design, taking a flex through right next to a moving arm.