Drop the preload all the way, compress the whole spring assembly a little, and the 2 halves by the rebound damper that are currently captured by the washer will drop out and the assembly can slide down over the lower mount
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Thats one of the halves.
That looks nicer than a Ludwigson frame, NCCR?
and you better shut some of your toolbox drawers before that **** falls over, LOL.