Originally Posted by Richard G
I still don't understand the precise roll of the spring in the quick load system.
Richard, next time you load your M,
try to put the film leader not on the spring, but at it's side if there is room for that (some M have room, other not),
you'll understand it's role.
How I know that ...
In a hurry, I load without taking care to the spring (so the film leader fell at it's side), and the sprockets didn't hook in the film holes.
When I reload after that "flaw loading" I saw the film was not pushed in place by the spring.