Toro 675 GTS mower spring

Hi
New to this forum but was wondering if anyone could help.
I am based in the UK and have Toro 675 GTS mower fitted with a Briggs and Stratton engine.
When mowing Under hedge a branch caused the mower to stall by lodging just inboard of the petrol tank.
I managed to get it going again but it now runs on full revs. I found at the time on the mower deck a small spring (please see picture) which I guess must of come off when the incident happened.
Thing is I just cannot find where if at all it fits.
Can anyone help by suggesting
1 if it is from the mower and
2 If so where it fits.
Any help appreciated.
Joe