Locking RCAs are stuck

Jdombrow has the right advice. If the ICs are really stuck on tight - use TWO pliers. One to turn the RCA barrel and the other to hold the rest of the cable in place so it doesnt spin along with the RCA barrel.

Rubber/duct tape will prevent the rca from getting scratched.

Wrap a rubber band around both parts and twist them gently with a pliers. And, I think Herman may be correct about the reverse threading.

All I can say is be very very careful removing the cables. Don`t want to mess up the rca much less the jack on the equipment. I use Kimber and Cardas cables and I prefer the Cardas because of this very thing thats happened to you. Had the same thing happened to me and I turned the equipment off and let it cool down and got some of those rubber thingies that remove jar lids from the fridge....and that worked but never again will I over tighten those things.

Good luck,

Happy Listening

Don't know about yours but some are reverse threaded. Try going the opposite direction.