GX12-2 Pin w/ 25" wires

External E-Stop

First remove the back cover, then remove your desired locations punch out

Remove the nut of the GX-12 Connector, and thread the connector from the outside. Use the nut to tighten it down from the inside. Then route the wires into the slot. 

Pro tip: If routing multiple wires at the same time, group and label them meaningfully as long as you know what they are.