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I have a 75 Carrera with Koni struts for which I ordered Koni inserts (not sure of p/n) a few years ago. Now that I am driving it, they seem to be too soft. They are clearly not externally adjustable, but sheet in box only shows the external adjustment even though box says 'adjustable'. Do I need to remove them and turn shaft, etc to adjust, or are they non-adjustables?

Thanks-