bad quality aftermarket fuel rails, what can i do ?

[ACII]

Hy all

finally i got my new set of fuel rails for doing a return fuel setup.

After i have checked the rails i found out that there are some small blades inside of the center whole...

For details pls check the pics...

I am from Germany so its not easy to send it back, therefore i hope u know any solution for smoothing the rail at the inside of the center whole..

Thanks a lot
Achim