For Christmas I made my son a light box to display some of his favorite liquor bottles (he's a college student, go figure). Naturally it has an electrical cord entering the box to supply the lights. I've looked high and low for a grommet/strain relief to dress up the hole for the cord. The sides of the box are 1/2" thick. Does anyone have any ideas where I could find something for that thickness? I could provide the strain relief inside the box but I still want something to dress up the hole.