I learned something useful last night and thought I would share. When using Inonotus Obliquus fungus as the hearthboard material for a handrill set, a notch is not required. Simply place the drill in any natural depression in the fungus and begin spinning. I had a coal within 5 passes down the spindle and rather than dealing with a smoldering pile of powder the entire chunk of fungus becomes a very large coal. Nothing short of immersion will extinguish tinder fungus once its lit. Sure wish I could paste a photo here...