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.
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