Hey Steve,
Is it possible to stack 1 pound weights that can separate based on what a person my need.
I was thinking we might be able to use the A frame from the handle. The tool is already built and it will allow the weight to be either above the rails or under the rails. I ordered some 3.000 x .500 stainless rounds, to play around with. I was thinking along the lines of overmolding them with a soft black plastic so they won't be reflective and they won't bang up anyones gear (or anyones head for that matter). This will allow for multiple stacking, put some index pins to make it easier to stack them.
Steve
That looks pretty close to the design of many other counterweight systems. Here is the CineCity one: