Then you would adjust the idle-stop/speed screw so that there is a 1-2 mm gap when the servo is in the neutral position. You might need to readjust the spring collars on the throttle linkage to force the throttle arm against the idle speed screw.
An illusion is a distortion of perception. The brain arranges, sorts, and organises data from the senses. Normally the system works well. Sometimes it does not, and we see illusions. In general, they are shared by most people in the same situation.
artifact. 1. any artificial product; a structure or appearance that is not natural, but is due to manipulation. 2. distortion or fuzziness of an image caused by manipulation, such as during compression of a digital file. film artifact artificial images on x-ray films due to storage, handling, or processing. phantom artifact artificial images seen with conventional tomography. standardization artifact an electrical stimulus of 1 mV deliberately introduced into the electrocardiogram so that pulse amplitudes on the tracing can be adjusted to 10 mm.