I'm repairnig another ancient Aiwa AD6900 cassette unit. It would make access to the deck much easier if I could remove the 3 sockets that protrude through the front plate. These are locked into the subchassis , the barrel (that the plug passes through) pokes through holes in a steel plate and then stout plastic rings pushed over the barrels to lock in place. Hot air gun to soften the plastic to remove ? Any attempt to prize off these barrels would be obvious as they protrude out the front plate.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on