1000 TCR throttle return spring

[grt]

Does anyone have a throttle return spring that is used for the TCR (please see the picture attached) or can someone know where I can get one?

As an alternative if someone was able to measure up one for me please – outside diameter, number of coils, wire diameter, drawings of the ends, etc. I would be most grateful.

Also can anyone tell me how the spring located or fixed at the bearing end?  I can see from photos how it fits on the arm on the shaft.

Thanks to everyone