Christopher Michael Fehn ( born February 24 , 1972 ) is an American musician and Percussionist for the band Slipknot . In Slipknot he is known as # 3 . Christopher Michael `` Chris '' Fehn ( born February 24 , 1972 ) , or known by his number # 3 , is an American musician known as one of the two custom percussionists of the Grammy Award winning heavy metal band Slipknot and is the current bassist for the band Will Haven .