@blksabbath
Alright, that sounds more like a problem of the thumbscrews not being long enough to tighten down the forks on the spit rod, I'm not sure a counter weight would have fixed that problem.
The forks should lock in tight, I'd go grab a new set of thumbscrews. Take the forks with you and maybe the spit too. I can't imagine there is a substitute for this other than the proper length screws. That'll keep everything spinning. Then you'll see about the balance.
You're still welcome to the weight, keep an eye at lowes for the whole set, because once you get the hang of it you're gonna want to do two birds at once and having the second set of forks really makes a difference for that.
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