George Curtis
TVWBB Olympian
Some spit rods have a round section cut into the square shaft.That looks like a great counterbalance if it is heavy enough. Just make sure you get it as "close" to balanced as possible on the spit.
The thing is with that balance is that you need to put it on an area of the spit that is round. Using it on the square part will only give you 4 possible adjustments.