Here is something along the lines of the "W" metal piece to attach the springs to the mounting brackets. Hope the pictures can show this...
The first picture shows up the best. Looks like just some 5/8" x 1/8" flat stock wrapped around the ends of the coils to fasten it. Came this way from the factory. Might be hard to get these pieces in on large springs.
My springs are pretty heavy duty for a wood door that weighs over 500 pounds! As I recall, it wasn't easy to replace the springs even when I was younger!
