you cant transfer weight aroudnd the car, from left to right or front to rear, just by playing with spring perches, whcih is all you are doing when setting corner weights whether using scales or mumford beam.
The mumford beam simply allows you to get equal weight on the 2 front tyres. The corresponding weight distribution across the rear tyres will be whatever it takes to support the CoG of the car. IF the car CoG happens ot be on the centreline then you will have equal rear weights also, and happily equal diagonals (which is what most people aim for with scales). So this works perfectly for your typical central driving position single seater.
If your CoG is to one side, the rear tyres will take all this weight differential if the fronts have equal weight. However, I've found this is still a good approximation even with a 2 seat car, and importantly it allows you to be consistent.
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