How would you do the math without scales? Maybe you were thinking "no electronic scales".No scales , no problem a simple math solution .
You need some kind of scales. After that, the math is fairly easy. The first time! And if everything is like you wanted, you're done. Real simple. The difficult part starts after that, if the numbers are not what you want. Not insurmountable, and still pretty simple math, just a lot of it.
Let's say your cross is off, from where you want it, by about - 1 3/8%. Do the math for that! It gets very difficult.
With my program you just change the cross percentage by that number and all the corner numbers change. Weights and percentages. Still giving you the exact same kart and driver weight. Same thing with the left and front percentages. And while you're doing this, your original input number stays the same, in case you want to go back. Which is also easy!
You're right, there probably are a lot of corner weight programs out there. I've seen a few of them, some good, some bad, but I've seen none that will do what mine will do. With absolute precision.