Abstract: A system to allow a visual determination of the rotational position of a rotatable object relative to a stationary object comprising a body defining front and back surfaces where the body includes at least one aperture having a diameter d1 disposed through the front and back surfaces, where the aperture is bounded by radial slots having a length l and extending outwardly from the aperture so as to define a plurality of fingers which may be independently manipulated so as to enable the body to be biased about a rotatable object inserted through the aperture and means co-operable with the body to allow a visual determination of the rotational position of the rotatable object relative to the stationary object.