I really like those knobs! I always wanted to use something like that, but never did find a good place to do so. It does look like the doors are up to 1/16" inch off in height adjustment. But, if you correct that, the knobs will be that far off. But, if you try to re-drill the hole for a knob, it will probably be off in the other direction. But, if you then adjust the other knob, it may be off horizontally. Isn't cabinet making fun?