Secondarys are right hand threaded so from the 12 O'clock position to the right is tightening and toward the left is loosening..ie righty-tighty, lefty-loosy. The first time I took mine off it took an impact with over 700ftlbs of torque and a special spanner to hold it to break it loose. It was rusted with thread-lock from hell..and it was only 6 months old.