I have just had purchased for me a 9 1/2 Horsepower Johnson "Sea Horse" Model No. 9R72M Serial No. A103667, short shaft.<br /> <br />Can anyone help with a date of manufacture, and/or tell me where I might find it on the machine or elsewhere? <br />Is there a kit available for this model to convert it to long-shaft? (a slight misunderstanding about transom depth).