wp rear shock

Howdy! I am replacing the spring on my 2015 RC390 CUP and can't figure out how to get the old spring off. I've gotten as far as getting the shock out and the tension off the spring, and now I can't figure out what to do next. No manuals available that I can find and WP is unsurprisingly...

I have an extra wp rear shock off of a 2015 cup bike with various springs for sale. I really don’t know what it’s worth so I am open to offers but please no crazy low ball offers. I also have a pcv with a dynojet quick shifter for a ride by wire system which does not work on my 2015 bike...