I talked with this guy a few months ago. He has a machine shop in PA and is making blades for Versaplanes. They quit making them a long time ago. Looks sweet and he will regrind them. http://www.ebay.com/itm/HSS-Spiral-Flute-Cutter-for-653-Versa-plane-/261181216065?pt=LH_DefaultDomain_0&hash=item
I wonder if he could make a spiral blade for skils and hitachis? I bet he would sell the heck out of them. Hows about we all send him an email.
Have been talking with Greg the machine shop dude. Just sent him pics of one of these to see if he can make some up.http://www.worthpoint.com/worthopedia/cyclone-grit-drum-skil-100-foam-102421357