I'm going to throw a wild question out there. Some people put an extreme amount of importance in 'scaling' the car. That basically is finding out what the amount of weight is at each corner of the car. I'm not denying that it is important. I'm just not sure that there is only one method to determine weight distribution. The common 'state of the art' method these days would be using an expensive electronic weight scale system.
I'm new to chassis tuning, so I may be completely wrong about this, but assuming that the springs are located very close to symmetrically about the car, wouldn't one only need to measure the length of each spring to get a rough idea of whether the weights were equal side to side?
Free lengths and lbs per inch specifications are available and can be confirmed, so why can't one use those specs to arrive at a rough weight figure for a particular spring?
For instance, if the free length of a coilover spring is 14" with a lbs per inch specification of 125 lbs per inch, and if you were to compress that spring to a length of 12 inchs, you should be able to safely assume that the weight that spring is generating is close to 250 lbs.
If you have 2 springs from the same manufacturer with the same part number and specifications, and the specifications have been confirmed, one should be able to safely assume that the weight of each spring, when compressed to the same length would be equal.
Am I way off here?