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@declan spring can be removed, early model you will probably need spring compressor, later model back off pre-load nuts fully should be able to remove securing ring of top of spring bearing plate and gain free movement of spring to remove lower bearing plate and remove spring, don't lose securing ring of top plate! My early shock bottom mount shot, 1st s/h replacement worse, 2nd one excellent. Spring diameter changes over years.!
With spring removed you can check compression damping also -