I appreciate that I purchased inexpensive bar stools.  They are to be used on my deck and will be exposed to the elements.  However, they wobble.  Three are close to level and I suspect once they are in use the problem will go away.  However, the fourth one is uneven by about 3/4 of an inch and I doubt that it will even "self adjust" to where it will be satisfactory.  I will probably have to do some carpentry to get this one to be usable.