Andrea Ungheri

Hi to all, in particular Luigi, I have found the same problem but this woofer has been already repeired (probably not perfectly, and this could have been the reason of the fault). Adcvices? How can I detach the spider and or the ring from the magnet? Do you know where to find the voice coil if to be changed? And adviced to restore it with the right positions and cetrered ... Do you have spare parts? Thank you very much!