Stepper motor brake

That is what I was thinking of using a fish scale. But, I have to wait till tomorrow to get it out of my boat. I’m new to this tool balance and tool balance retractor. I seen on you tube a video https://youtu.be/X7-6HAyUHcI
It shows an example of a balancer, retractor and a positioner. I think a positioner would best. What are your thoughts on this?

Thanks,
Carl