Just purchased one to sharpen 404 harvester chain. Go figure had to modify it to fit the 80 gauge drivers. Lucky it was just a shim job with washers. I did a good job all the cutters look good. I need to figure angles out a bit. I only cut spruce with it. I think it’s optimized for hardwood that’s probably not frozen. Only thing less favorable is it’s a 12mm arbor vs the standard 7/8 that most wheels are. Currently using a Belsaw/Frowly wheel.