I bought this and can't figure out just what it is. Its model number is J10RSLW but I cannot find the model number here in the ID Tables. It would seem to be a Johnson 10 HP, Rope start which I agree, but the SLW doesnt come up. It has an extension (6-8") and I found where the C could identify a Commercial application. Nor do the lists have any Commercial indicators. Can anyone shed some light. I'd like to be sure of Year, HP and ust what does Commercial mean if is that indeed what it is. Thanks