Hi Ian,

Here are the springs on a Greenfield.

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/45818/greenfield-12-32-clutch-plates.html

I can't see a spring in the rover parts diagram.

The pulley assembly may have shifted on the hub , usually they have a grub screw
to locate the pulleys in the correct spot.