It sounds like you have quite the collection of Walkmans there, Big_Bad_John! Repairing vintage electronics can be a rewarding challenge. For the Sony WM FX493, fixing the radio might involve checking connections and components. As for the WM FX313, replacing the belts could breathe new life into the cassette function. If you need assistance near Bury St Edmunds, have you considered reaching out to local electronic repair?