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That is a great idea,thanks for the reply.No access to the head inside... you can get a Dremel and diamond "cut off" wheel, cut a slot in the nut's end of the bolt/stud. Hold the bolt with a flat blade screwdriver and turn the nut with an open end wrench (maybe) You might weaken the nut in the process of cutting the slot and so might need to replace it.
This trick does not always work... Its based on a type of needle valve with a locking nut. Fairly low torque application allowing you to hold the bolt with the screwdriver. Higher torque and the bolt is potentially hard to hold.
If its a stud into a threaded backing plate, this trick is just about the best you can get. Once the nut is off you can then pull the stud. and replace with a longer one.