Originally Posted by kin
if you want to try my SM 6504 blades i can offer you a compare with that narrow blades . my blades also narrow but hot that exteme! and i am semi=symmetical air foil . if you say yes , i 50% less offer you .pm me
was it a bubble, or a tiny resin inset that has been put there for blade balancing? mine has them too. still fly fine.