Screw two nuts onto the stud. Tighten them together, (against each other).
Then use the lower nut, (nearest to the cylinder) to put your spanner on & undo the stud.
Like Fenton says, some kind of penetrating oil left to soak in for a couple of hours before will always help.
You can use this method to instal the new stud. You have to screw the new stud in using the top nut this time though.
I`ve used it loads of times after my Dad told me how to do it. Works a treat!
There`s no messing about with horrible mole-grips & the like! Doesn`t damage the stud either.
Of course, if it`s really stubborn, then you may have to use the two nuts & mole-grips together!
Last edited by Chester362 on Sun Nov 26, 2006 7:06 pm; edited 3 times in total