RC helicopter?

i have a mini rc helicopter similar to this one:

http://www.trademe.co.nz/Toys-models/Radio-control/Helicopters/auction-160854030.htm

But the way the very top propeller and the big propeller have kind of come off the two pieces of plastic that hang down the middle from the top propeller are attached just like the middle bit at the top. how can i fix this?
i have put in a seperate pin but this just caused it to fly funny

I have bought these a few times from Netto.
They cost me £10 each time and I play with them 10 minutes until they invariably break.

Then I just take them back.
I dont abuse them but their delicate nature means that they are likely to break as you have discovered.

Fixing yours could be difficult since the components are lightweight molded plastic.
You may well improvise but every extra gram is payload it cant handle and the geometry of the machine will inevitably become unbalanced.

Send it back if possible.