Topkick,
Welcome to the Stovebolt. Your polished diamond plate must be aluminum...right! My thought would be a jig saw or saber saw for this material as opposed to a shear or nibbler.
18 gauge is fairly thick for a hobby sized shear and I don't think that includes the thickness of the raised diamonds. I'll bet a Bosch jig saw with the proper blade, cutting from the smooth side would do just what you wanted.
Stuart
Last edited by atomarc; 01/22/2009 2:08 AM.
