Locking RCA's can sometimes prove particularly stubborn -- I've used two brands (Outlaw and TMC), and at times both have not wanted to loosen. First, let's get our control volume defined here... If you are looking at the back of the CD player , you should turn the silver barrel clockwise to loosen it (at least, that's the way my memory swears that it turns at the moment -- I've got an extra set in the closet at home that I can verify this on later tonight). If it doesn't want to turn on its own, hold the yellow section at the base of the plug still -- that part should not rotate, and can offer some useful leverage when the plug is particularly tight. If you are looking at the front of the CD player (reaching across from the front and working blind, for example), then the counter-clockwise direction is correct.

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