how do i take off track rod end from the power steering end

iam trying to take off track rod end balljoint (not from the hub end)from the power steering end,but it wont come off it seems to be seized.
try wd40 oil/heat,lots of force,wont move at all. theres a locking nut which should move when applying force to it but it wont move at all.this is a ford escort 1998 1.6 16 valve zedtec engine any sussgestions.
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