Alex go carefully with the reassembly of the guide rod and springs as once compressed there is a hell of alot of force waiting to let go and you have to lift the whole lot into position with the bogie frames before letting of the tension. I used a builders sash cramp and ended up welding it to both balls as I had 2 attempts initially without welding and the sash slipped off with explosive results
If you can get hold of the spring dismantling tool (Australian) that will make the job so much easier, as I was offered one to use after I had done the job and wished it had shown up earlier ! Good Luck and thanks for posting the pics. Look forward to them ! David.