I've been accumulating folders for more than 20 years and now have a ton of them. Along the way I picked up several with smooth metal scales...steel, aluminum and titanium. I have large hands and they're too slippery to handle effectively and safely. I want to modify them and don't know the best approach. Simple sticky-back traction tape (if so, what brand)? I have access to a sand blaster if that's an answer. Or maybe file a crosshatch pattern? Thanks in advance for your assistance.