Which bolt to be more specific?
To install a rear spring you hold the rear arm/coil bucket towards hub with jack and unbolt the arm off the hub and slowly lower the arm still attached to the other side.
The outboard bolt that holds the spring carrier to the hub. The cv shaft goes into the hub assembly and is right next to the nut to remove that bolt. I am talking about the outboard bolt to the spring a carrier and it has a little bushing in the middle.
Got the bolt out by removing the bolt from the nut instead of the nut from the bolt. Was worried it might destroy the bushing in the middle but it didn't. It looks like you do the same to get the lower shock bolt out as well when replacing the shocks. The R50 I use to have was sure a lot simpler. Anyway hope this helps the next guy that tries this at home.