1999 Chevy Tahoe AIR BAG

HI IM HAVING AN ISSUE.....I WENT TO SHIFT MY TRUCK INTO GEAR AND THE LINKAGE BROKE ALL INSIDE THE STEERING COLUM......I ASSUME THE CABLE WAS MESSED UP AND THE STRAIN WENT TO THE 2 LITTLE ALLUMINUM PIECES IN THE COLUM AND BROKE.......I WENT TO THE SALVAGE YARD AND BOUGHT A VERY NICE USED COLUM WITH WHEEL AND AIR BAG AND GOOD CABLE......150.00.......MECHANIC INSTALLED IT FOR 145.00.....NOW MY AIRBAG LIGHT IS ON....HE SAYS THAT BECAUSE THIS COLUM CAME FROM THE JUNK YARD THE WHEEL TURNED FREELY AND MUST HAVE BROKE THE CLOCK SPRING......NOW ITS 100.00 FOR A NEW CLOCK SPRING AND 50.00 FOR HIM TO PUT IT ON.....IF INFACT THIS IS THE PROBLEM........I CHECKED THE CONNECTIONS UNDER THE SEAT.....ALL GOOD....PLUS MY OLD COLUM DIDNT HAVE THE LIGHT ON...SO WHAT DO YOU THINK...........................