Has anyone tried one of these? http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=33487 Comments on how well it works, how flat it is, etc.? The ad says .002" which is horrible of course, but perhaps it should read .0002" which would do for my modest needs. And I would probably take a skim cut off the top anyway. Randall --