one thing about the replacement main and feather shafts though you have to pay attention to , the newer v2 and pros have 2 bearing main setup my exi clone had 3 bearing setup i bought some aligns from a hs a hour away and didnt realize they are for a newer bird. i gave the exi to my bro and he needed a main as i was putting it in i seen it was made for the 2 bearing. we went ahaed and tried, it it works ok but i dont know if its putting extra stress on the frame etc but like i said it was flying ok no weird noises etc. and also theres a v1 and v2 head and 2 clearly differant feather shafts so make sure if you order you get the correct ones.