Gotomow - I have not tried that method, I have only measured from the edge of the deck on the sides and the ends. One thing I did find curious is in order to level the deck on the sides, they have these long hook bolts with a nut on the ends. This is supposed to be one of 3 similar points on the deck that can be used for this adjustment. Funny thing is one side is definitely off by about 1/2", but in order to get them both level the left side bolt does not seem long enough to compensate at the lowest setting. I did hit a root a while back that bent one of the spindles and blade and I replaced the whole assembly. When I did this I checked the deck to see if it was bent and it did not look bent. I wish this thing had 4 wheels on the deck, but it only has 2 so sometimes if I am not careful one side will dip and scalp. Also wondering if maybe the belt needs adjusting and the pullies are losing traction. I know this does not have anything to do with the uneven deck, but might help with the cut quality.