Sadu opened in 1998 as just a little booth and display case in the back of the now-defunct Milestone Records. Today, it’s the place in Charlotte to get tattoos, tongue studs, belly rings, nose hoops or — guys, brace yourselves — a frenum ladder, in which several metal studs are inserted through the skin from the base to the top of the underside of the penis. The funky little store has about a half-dozen display cases with a treasure trove of body jewelry made from all kinds of materials including glass, wood, metal and even fossilized walrus and mammoth tusks.