Can anyone show me where the idle screw is please
Allen, although I don’t have this model of auger, here’s my assessment. If you look at the last of the 3 pic post you posted above, that is the idle speed adjustment screw. If you look closely, that screw tapers to a point, and the throttle plate linkage arm rides on that taper. As you adjust the screw clockwise, the linkage plate rides higher on the taper, holding the throttle open further. Counter-clockwise would reduce the idle speed.
Hope this helps.