I finally received a reply from Eduard:
> Dear Sir,
(Oops!)
>
> Firstly we would like to say we are sorry for the problem with our
> product and my late response.
>
> We would also like to inform you, that we have changed the system of
> accepting claims.
> If you have bought the product directly from us, we will kindly send
> you spare the parts. Please let us know, sending email to
>
department@eduard.com.
> Otherwise - if you bought it elsewhere, please issue that seller, the
> damaged or missing parts will be re-ordered through him.
>
> Best Regards,
So that's it. If you bought a kit from a dealer, they're making it the dealer's responsibility to claim for replacement parts.