Sorry it's taken me so long and for such a bad pic. The rover is in the back corner of my garage that would send fear deep into the heart of the bravest mountain goat.
Anyway
I haven't forgotten and hope this ties you over. Would you like measurements so you can fab a replacement item?
I'm in the process of cleaning the shed up anyway.
[Linked Image]
[Linked Image]

The long spring belongs to the clutch setup
The shorter is the brake return. If you're looking for a return spring the average self respecting engineering supplies or bolt shop should sell them. Alternatively head to bunnings and pack your wallet.

This
Is going straight to the pool room.