those plugs are super easy to change. All you have to do is cut off the old plug, strip the wires and reattach to the new one by wrapping it around a screw inside and tightening down. You just have to make sure the hot wire goes to the hot prong, but there are several youtube videos showing which wire to put where. I just did a couple plugs like this for my new enclosure. I didn't want to cut holes big enough to feed plugs through so I cut them off, fed the wires, and put a new one one.
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