There was the vestige of the centre core protruding but not enough to catch hold of. I discovered that the plastic remaining in the socket could be levered out with the tip of a craft knife or you could use a pin to remove the top plastic ring insulating ring of the jack left in the socket. For my fix to work you have to remove this bit of plastic. You maybe able to shake it out or hook it out with the bent tip of a pin.
- Satay stick, wooden kebab skewer or similar piece of soft wood to fit in jack socket.
- Super Glue