My FX45 had broken a minor crash while the rotor head, with this spare part he flies back ,. The expansion of the flybar (the metal part at the upper rotor with two weights) Gestalltet to be difficult here helps a metal nail and a hammer with which you can hammer out the bolt caution. Then reinstall everything ... Done. Test flight was ok However, the swash plate has shifted somewhat - but that's just a state of mind ... So I can only recommend this rotor head because it is exactly the same as the FX45 ...