there is no lock. just the tension from that clip that holds it in place. It takes a fair amount of force to pull it forward out of that clip. I slide my hand, keeping it flat in behind my TV keeping it as much in the center of the back of the TV as possible and then it takes a fair amount of pressure pulling forward to get it to pop out of that clip. I keep my hand flat to spread the pressure out as much as possible over the back of the TV.
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