Hello David,
I can confirm that it is possible to replace your springs using the threaded bar that you used to remove the springs,to make the alignment of the spring in the bottom control arm easier,before you mount the control arm onto the axle, locate the spring into the bottom control arm indentation and use some white paint to mark the correct position on the spring and control arm on the stub axle side of the large hole in the control arm,by doing this you will on tightening the threaded bar make sure the spring will correctly position itself in the bottom control arm indentation.
I have just done this today and marking the position made the job easier.