reuse bulkhead wiring block

Hope that's the right term. I'm rewiring my 62 Savoy and would like to reuse my old bulkhead wiring block. Are they reusable ? I can't get the wires out. I'm thinking there is a secret trick like sticking a small screw driver in somewhere, but I'm not having any luck.

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get a mini eyeglass screwdriver & insert it in the little notch on one of the long sides of the rectangle on the front side & Carefully flatten the locking tang on the back side of the brass terminal. Keep trying and do not bend/force anything or lever the screwdriver too far to the side which would damage the bulkhead & when you have it depressed the right amt the wire/terminal will easily pull out of the back side

Thanks Robert. That did the trick. Just took a bit more push than I expected.