I decided to replace the bean discs on the kinze planter this year.  I got them from my dealer and when installing them I noticed they were not "true" when I would turn them.  They would move in and out by about 1/8 of an inch.  Is this normal or should I return them and try some different ones?  My old ones stay straight when they are turned.      When I would set the new disk on a flat surface you could tell they had a wave in them, old ones were flat.

Will it affect the way the meter seed?