Hard Drive puzzle

This is my new puzzle, Hard Drive. The goal is to insert and stack the four discs inside the frame in the right order and with all the correct magnet polarities. There is only one unique solution. Look carefully at the magnet distribution: the top polarity is for the magnet to be inserted on the visible side of the image (the top part of the piece) and the bottom polarity is the one that should be facing upwards when you flip the piece upside down. To make it easier, all magnets follow the same principle: if the polarity of that magnet in the picture is north, then stick that magnet with north facing upwards in that hole; then the corresponding hole underneath will require a magnet with polarity south pointing upwards. Another way of remembering this is that the top magnet and bottom magnet for the two aligned holes should always attract each other. By the way, the puzzle requires 20 D6mmx2mm magnets. The printing profile includes three plastic rods D6x40mm (diameter 6mm), however, I r