I think the accelerator return spring (at least I think this is what it is called

I have just replaced the accelerator pedal push rod that fits into the linkage below as this had worn out, but the accelerator does not return back to full hight when I release my foot and naturally the revs remain higher until I physically lift the pedal.
Looking at the spring it appears to be intact, but does not seem to be able to secure to where the throttle valve is so just spins round rather than being fixed in place. The 'arm' of the spring is intact and I can see where this sits on the thottle valve and returns the pedal to upright position.
Is there something broken that you can see from the pictures below, or can I attach it back somehow?




Thanks in advance for your help!
