How to level stacked washer and dryer

I just installed a stacked washer and dryer myself and they are no longer level. I leveled the washer on its own and double and triple checked to ensure I was level in the closet. Unfortunately the level legs do not have a lock nut, so after attaching the dryer with the stacking kit and putting in the closet the balance is completely off. More than one leg has changed since pushing the machine in place.

Can I level this thing with the dryer attached? Any tips for keeping the leveling legs locked in place even though the manufacturer didn't put a locking nut on them?

Please let me know your thoughts.

via How to level stacked washer and dryer
by johnnycage