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3415S traction/differential lock

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I recently picked up a Sovereign 3415S with cab and blower. It has the wheel weights and tire chains, but even on the smallest incline the left rear wheel spins making clearing the driveway fairly tedious.  From the previous owner, the chain on the left is badly worn.   I have had to get off many times to get it unstuck when blowing snow.  I am trying to find a starting point of where to go from here. Is there a way to easily lock the differential on the 3415S?

I found on the forum in regards to 1965 landlord the following.  Is this similar on the Sovereign units?  Or is there some easier way to lock the differential that I am not aware of?  any help is greatly appreciated.  

"The two bolts that go into the hub are 7/16 UNF. They are available at most hardware stores. To lock a differential you take washers from between the axle gear and the gear that is attached to the right hub, and put these washers behind the axle gear. This makes that gear grab both sets of the planetary spyder gears and locks the assembly. For differential action there should be only one thin washer behind the axle gear and the rest should be between the two gears to separate them."

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More weight! Don't bother with locking the diff. Had same problem on the 169 cadet I have my blower on, wheel weights not enough. Made a bracket for the back of the tractor that'll hold another 130 lbs. Will go anywhere now with the chains on.

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