Disasemble to go to wiring

The dc outlet of my aws scale ps -25 went inside the wiring, i need to remove the parts, to go to the wiring, I removed 2 plates, the last one is metal, how can I do it, I have a picture of this scale, in this item, i can put a picture where i am now if is necessary…

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@lobosagrado use this guide Adding images to an existing question to add pictures to your QUESTION

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