hi guys, okay started to install tall kitchen units had no problem in levelling on base of unit, back to front and side to side however....when placing the level on the sides of the unit it is not level, out by approx. 10mm from bottom to top? one of the units is for an intergrated 50/50 f/f the other is a cage larder unit, having never installed a kitchen before my question is do i level the unit sides and throw out the level on bottom?