I sand off the flash, never have noticed any drag and I don't slice my hands if I need to flip the prop with my bare fingers or get a prop out of my flight box. Take an old CD, DVD and cut in in half. Glue the two halves into a piece of flat balsa wide enough so the finger balancer fits between the hole halves, Shazam, a balancer. I use clear lacquer paint to balance my props. Just spray it on the light side until it is in balance.