Donald,
   The first OC-3 I ever saw/ran was one that was owned by the Dept. of Forestry in Connecticut.  It had a Dearborn loader on it with a homebuilt V-plow. for such a little machine it sure could push snow! It had been sitting in a barn for a long time and I was originally told it was &quot;just for Blizzards&quot;. It drove me nuts that we could not use it but I think the boss finally gave in 'cause he couldn't stand the crying. There was also a pin-trip bucket for it so I ended up switching it out and  ended up using it a lot. Winters we worked in the pine forests thinning out the pine stands and pulled all the pine out to a landing with the little OC-3. It was the greatest machine in the woods, particularly in a tight stand. Once we had the pine skidded out to the landing we piled it onto a  bucking deck of sorts  where we cut the pine up into 18 inch &quot;bolts&quot; to be used for wood shingles as forestry had their own shingle mill. The Little Oliver was an industrial (OC-3-42-IND... I still remember it) it did not have the usual pan seat, but a seat with armrests and also had the double transmissions.  The poor little machine never had a decent air cleaner on it so over time the engine lost power from taking in dirt. It finally seized  from sitting and was taken to auction but I saved a lot of parts from it. Wish I had that little machine now, in high gear it seemed to fly! 
 My cousin lives just down the road from me here and he had an OC-4 that he tried to give to me but I did not take it. It had a straight blade with manual angle... a nice little machine but had a lot of late night repairs....
Some snow due tonight.
          Cal