I haven't tried this for a while, I know the last time it did my head in.
Using 4 points I don't get how it is possible to get any meaningful result. Imagine you just balance the kart on two opposing corners and then gently slid the other two corners under, you would get a vastly inaccurate result, with most of the weight still on only two points. Now if you kept shimming the other two corners up even by tiny amounts the results would change massively, like my fridge analogy.
I've reached the conclussion that it would be best to do each end of the kart seperately. Putting a block under the measured central point of the front end and then weighing each rear wheel. Then do the reverse for the front wheels.
By supporting the kart on 3 points rather than 4, a much more accurate reading would seem to be possible. Wouldn't it????????
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