There are also speedos with a trip on the bottom face of the speedo body..Used on nacelle model BSAs and Triumphs, Ariels and Enfields with alloy speedo housings etc. where a 'side' trip isn't possible...Ian
Well looks like mine is mismatched the body of mine has no hole for any reset button to fit through. Not overly fussed was just curious, might be good to find another body with the hole for the trip and the mechanism