I think the jack idea is one way suggested on one of the Morgan sites, but I would be very wary of this method. As the rebound spring emerges from the lower plate, if it slips sideways it could be very hazardous.
If the main spring is at the standard length, you can't get it out without half an inch or so of compression. although an alternative method is to drop the kinpin through the bottom (this would keep the rebound spring under control) then pull the main spring out. That method requires thick gloves and some protection for the inside of the wing.
I would like to see how the factory fit these components, but have never managed to catch it being done.
