Underbar says it's tightened up its customer screening to keep another guy from coming in and slicing people up, following a May 3 fight that left three stabbed.

In addition to pat downs, people entering the 275 Tremont St. dance club are now also being checked with a metal-detector wand, George Kalevas, Underbar's manager, said yesterday at a hearing before Patricia Malone, director of the Mayor's Office of Consumer Affairs and Licensing.