I have succesfully taken my main shaft out. Not sure if its the right way, but new shaft is coming today and i will probably install it soon.
I unscrewed a couple of screws from the frame to lossen it a bit to get the Bearings out. My shaft was bent so it was extra hard to get out.
I think you have to just use a Allen wrench below the swashplate. There is a nut with a screw in it attached to the shaft. Use the Allen and loosen it up. It might just slide out with ease.
But if you can lift the shaft up a bit, you could get that pin out next to the gear then it should slide out just like p3tra said.
Hope this helps.
Hopefully i can upgrade my v2 or ill be crying on the forums in a bit.