With this inner shaft, you won't have troubles anymore with the so called
blade strikes, the fact that lower main blades hits the uper ones.
Beware, the is a supposed difference between 1st and 2nd versions of the
Xtreme inner shafts. Comparing both outwardly and an inquiry with the
manufacturer showed that possibly causes of worse flight quality should be
searched elsewhere. Make yourself sure that the Flybar (stabilizer) is able to
move with little resistance. Adjust the ball link length (between stabilizer and
main blades) so that the flybar is parallel to the uppes blades.