Clem this is how I applied it to my Model T springs, I did have to get a tick longer center bolt that was needed due to the coating on the springs.
I used a long 3/8 threaded rod through the spring pack and clamped several areas together to compress the leaves. Drove out the threaded rod and inserted the new center bolt.
The real fun part was getting the rear leaf/shackle/spring perch together
