Chrysler Repair: 97 Sebring convertible, pivot bolt, negative cable

Question
QUESTION: My daughter has a leaking top cylinder in this vehicle.  It seems to be leaking where the line & piston come together.  I can't get this tightened up.  The nut just keeps turning.  Is there a trick to tighten this?  can it be tightened?  or should I replace both and if so how do you do that?

ANSWER: replace them   

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QUESTION: thanks for the answer "replace them".  How do you replace them?

Answer
HYDRAULIC CYLINDER
REMOVAL
Disconnect battery negative cable.
Remove rear seat cushion and rear seat back.
Remove quarter trim panel.
Remove cylinder mounting bracket and nut Hydraulic Cylinder
Remove pivot bolt holding cylinder shaft to top linkage.
Disconnect hydraulic lines from the cylinder.
Remove cylinder from vehicle.
INSTALLATION
Reverse the preceding operation. Fill hydraulic system and check for proper operation.