Does anyone know how to safely remove the steel security lug from the back of the case? This metal lug slots into the "security" tabs. I've tried to remove it but afraid I'll snap the plastic tabs off.

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I removed one many years ago. With the rear case bucket removed, the plastic tabs can be opened up on the inside using thin bladed screwdrivers or putty knives. It'll take two people to open up all of the tabs simultaneously. A third person to pull the security lug free is helpful but not essential.