Ah, that makes sense. It does rely on the rolling surfaces being perfectly flat & horizontal. The spindle resting on two wheel balancers would be perfect!
They dont need to be perfectly flat or horizontal, I use the edge of my wood burner and a chair, with this way of doing it you can balance then put a 2g weight on and it will go straight to the bottom in about 20 secs it is that good, once you have done it you would not buy a static balancer as it is far quicker and slightly more accurate
