ON MY 64 THE COLLAR WAS LOSE WHEN I GOT IT, I TRYED PUSHING DOWN WITH EVERYTHING FROM FINGERS TO PLYERS. COULDN'T GET IT TO GO DOWN FAR ENOUGH TO TURN AND FASTEN, FINALY GOT A 1 1/4" PIPE COUPLER WELDED BOLT ON EACH SIDE FOR HANDLES,TOOK SHIFT NOB OFF PLACAD OVER SHIFTER PUSHED DOWN AND TURNED WORKED GREAT