This is the 2nd customer now who wants a plug in the back of her master bath drawer for a hair dryer, etc. There is a wire in an electrical box ready in the wall behind the cabinet. I need to get a flexible wiring method to a plug in the back of the drawer. I need something legal that won't bind when opening and closing the drawer. I have asked electrical stores. They don't know. Someone suggested 3/8" flex. I guess that would work, but it might bind up. Suggestions?