Dom, if you pulled the spring pack off the axle there usually is a centre bolt that clamps the spring pack together. This centre bolt also locates the springs relative to the axle. Un-doing the bolt allows the leaves to separate. What you then do is insert a couple of springs/leaves into the spring pack, but their length must cascade or be between the length of the spring they are wedged between,(like steps) then, you clamp the spring set back , might need a longer centre bolt, and the fun then begins as you can easily locate one end of the spring eye, but the spring pack is now stiffer, so you have to jink around to get the other end in the pivoting spring mount on the trailer.