<span style="font-size: medium">From the pictures it seems that it's a coax heli.

Yes, the gears can be replaced, however it a very cumbersome - time consuming task.
It gets messy. I'd rather change main and feathering shafts on my 450''s and 600's anytime.


See if you can re-groove the existing gears with a sharp metal object. I have used a
surgical scalpel to re-groove my Walkera 4F180 (single rotor fixed pitch). It is not the
ideal thing to do, but takes care of the wack wack sound on spool up.

If you like coax helis, you should try the Syma 031 they are built like tanks.

Hope this helps</span>.