The 6th hole at CNC Links south of Manitowoc has proven to be a lucky one for Manitowoc resident, Norb Wronkowski.  Norb aced #6 on the par-3 course yesterday for the 2nd straight year.  The hole-in-one on the 72-yarder was witnessed by Mark Duzeski.  It was also Wronkowski’s 4th hole-in-one in his golfing lifetime.