I've noticed a lot of people here like to tweak with their knives. Numerous people like to reshape the blade edge, tip, etc. I've personally modified several sheaths, ground off serrations (CRKT Mirage and SOG Seal 2000), and improvised sheaths or carry options (mostly with cord and webbing).
What is your favorite knife / sheath modification or innovation?
What is your favorite knife / sheath modification or innovation?