Hey everyone honestly there's a super simple way to get the usb in the black insert.
The backside has a long rectangle sized rod coming out of it with a cross support inside, if you match up a usb plug it is the same exact size.
Then what you have to do is trace it on the front. Cut the front out, and then go into the back and cut the supports out.
A small round file was very handy, and I imagine one with a straight edge would make it even cleaner. Only hollow it out enough for the usb plug to fit super tight.
Put a little super glue on the usb cord and jam it in until its flush with the front.