Ok, I'm keeping it for now. I was thinking ...
Step 1:
I'll ask the nice lady from e-bay who sold it to me (she's really helpful and all this is not her fault. She can't be responsible for a fawlty device from the moment I forego the guarantee. She explained, I understood) if there is a chance in a million to be done s/thing about it.
Step 2:
If nothing can be done, I'll post an announcement for anybody who might have need of spare parts.
Thanks for remind me of the others. In my, kind of depressed mood, I completely forgot about my fellow eBookwise user