I just recieved a medium and fine benchstone from Spyderco.
Holding the white one (the fine) up against a lightbulp I could see just with my eyes that it was bend. Holding it against my veritas straight edge I was able to freely push a 0,25mm feeler gauage between the straight edge and the stone.
The Medium was not so bad, it was bend about 0.09 mm which is still too much to my liking.
Are these stones so much out of flat that they should be returned, or is it just a matter of working them against my DMT flattening plate ?