I just got Tony's screws kit in the mail for the 811e and lets just say, it's awesome! It comes with metal nuts to replace the old plastic ones, every single one. And washers and screws to replace the weak stainless steel ones. I recommend everyone who owns a serpent to by this because then you never have to worry about those crappy plastic nuts that strip all of the time. And as far as the csi pistons go, I hear they are the best money can buy(lots of it) lol. Those with the webbed bladders would be evil.