There's a great one on YouTube. If I wasnt on my phone I'd link you to it. Just look up removing keg spears and then look for the one that looks like yours.
equipment: 5 L Super Reflux Still - Copper Packing, separate condenser and reflux cooling circuits Braumeister Clone (for the beer guys) and 2 tap fridge
Get some pliers and push down on the black seal. Grip onto the metal inner part and turn clockwise or anti clockwise. Can't remember. Falls apart then.