If by now you haven't changed the springs; heres the easest way to do it
Get two packages of cloths pins at walmart
remove the springs; now you have two halves
extend the jack you want to change the springs on
slide 15 clothspins on on side of open spring 180 degreas slide another 15 cloths pins
retract jack
you will need to help the jack up; with the clothspins in the springs they wont go up, I use a 6 foot long 2 by four
springs now can be removed real easy
tie 6 foot piece of strong rope to each end of new spring
Tie one end of rope to strong object ( I used a telephone pole)
tie other to car bumper; I used the trailer ball on my truck
strech spring far enough to insert 15 cloths pins on each side; just like you did on the jack
back up truck remove spring rope
put new springs on jacks
run jacks down cloths pins will mostly fall out; ones that don't can be removed easy
your done
should add the cloths pins need not go in all the way; half way is usualy far enough