yh the nut has to come off, like every one said its the tighter than a tight thing! i had to use a legth of scaffold pole with my dads breaker bar. just get one person to put ther foot on the back of the socket to hold it square otherwise it slips off well easy. it still takes some fair force on the scaffold pole to get it off! just stick at it and plenty of penetrating oil! oh and its defintily anti clockwise.