Propeller Adapter from 8mm to 5mm Mikrokopter MK drives / Propeller Adapter fÃÂür von 8mm auf 5mm Mikrokopter MK Mitnehmer

I think anyone who searched this part knows what it is and how to use it. ;)
It's for a very special constellation I have in my personal setup.
If there are any questions about anything - feel free to ask.
These are the parts for what this adapter was designed for:
Propeller
http://www.graupner.de/en/products/0e83a7f8-937c-4999-aa76-dda2618f2c65/1326.11X5/product.aspx
others might have the same diameter (8mm) so as long they have the same hight any other propeller should be compatible.
The following drives should be compatible:
https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=75&products_id=465
https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=75&products_id=466
https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=75&products_id=556