Ok, the gearstick on the project nova was ok then all of a sudden it just dropped to the side & now it wont stay in the middle & has gone really sloppy

It goes into gears fine but it just wont return to the middle & has no springiness.

I know with Fords there's a spring which keeps the gearstick central & returns it to the middle when in neutral - is there one on the Nova or have I messed something else up?