I was really enjoying flying my x-cell pro heli the other day (still learning but progressing nicely) when I lost the tail rotor. I panicked and set it down hard, and from the tailboom mount aft the heli is toast. I later figured out that the bolts holding the upper main bearing in place vibrated out and caused the tail rotor to bind. Anyhow I am going to put this heli up for a while so I can learn on a cheaper heli. My question is what upgrades would make it a real nice heli in the future. I have the rear servo mount for the tail rotor servo, but I think that is pretty much all that is not stock.