if you scuffed the blades the your probably looking at replacing the either feathering shaft and maybe even the main shaft as they are pretty weak. and the balance might be off now depending how deep the scuffs are on the main blades. 250s are very quick little birds !! imho you maybe should have gone to the 450 or even the 500 size but thats just my opinion. i have a 250 thats fun to fly but the lil guy will get out of control pretty darn quick if you arent tending to it.