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How did you level them to begin with?
I used a water level (basically a hose and clear graduated tube) - I took one footing as a datum, and levelled the top of each cardboard form. problems crept in trying to get the concrete pour to the right level - Time constraints, slightly different hole volume, and one form being just over a safe mixer load, meant that I didn't always have the right amount of mix.
The feet are for timber buildings - each one can take 450kg, so I'm well within tolerance
The concrete footings were pretty difficult to keep level, although I did manage to keep them all within 10mm and the base pads have double screws, which allow for up to 60mm of height change - I used a water level to re-level once everything was squared up