Be careful trying to turn the spring seat with the locking screw tight as said above, you will destroy the threads on the height adjustment threaded body!
Did you double check for two locking screws?
1) Make sure the locking screw is fully out.
2) Spray the spring seat with some releasing spray or WD40 and let it soak in for an hour.
3) If the threaded body still rotates, get hold of an electrical socket wrench or the rubber gripped pipe wrench and grip the threaded body with them as you turn the spring seat. (You could improvise with electrical insulation tape and a pipe wrench to protect the threads)
4) If the above fails - take a large flat blade screw driver and a hammer, put the screw driver against one of the flats in the spring seat adjuster and give it a tap in the direction you wish to turn it, it will free off the sticktion that's binding it up. Don't go crazy or you will damage the spring seat, just enough to get it moving.
Once you've got it going, consider using a dry lubricant on the threads, a dry chain lube is good to protect it from further binding without attracting a lot of dirt to stick to it.
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