atomicbrh -- thanks for the "plug," it's much appreciated!
botics -- to the best of my knowledge (though I could be wrong), Anderson doesn't offer a counterweight, so you'd have to rig something up "DIY" in that case. On the other hand, my Deus II shafts can (optionally) be built "counterweight-ready" (i.e. with threaded fitting installed in the butt end of the shaft), and that fitting is what enables my counterweight to attach to the shaft. It can be added or removed just by screwing/unscrewing, and the amount of weight you use is adjustable (as you can unscrew the cap of the counterweight, and add or remove weight to the tube as necessary).
Please contact me if you have any questions, or would lie more information.
Thanks,
Steve