woofer 75gdn-3 sealed with adhesive plaster. repair and restoration of the speaker

speaker hand woofer 75gdn3 glued adhesive plaster repair restoration dynamics suspension mesh protection glue rip off ushatanny damaged diffuser soldering iron ussr soviet acoustics 70s flexible wire flux rosin equipment audio workshop music professional volume 20gds3 high quality background isolated tool plug coil support auto powerful bass vintage sound recording studio listen renovation loudspeaker view monitor