You need two nuts that match the thread on the stud.. you thread the stud in far as you can by hand then the two nuts thread them both on to the stud till just just enough to be securely on the stud. then then oppose thread them so the two nuts lock against each other turn the top nut clock wise to tight stud and tun the bottom nut anti clock wise to undo the stud to remove the two nuts turn them simultaniously in opposite direction to loosen then just undo them off don't feel the need to over tighten the exhaust stud it only needs be nipped in there it will naturally get more torque when you mount the header back on any way - hope this is help to you regards Jamie
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