scratched key cover

[richard.ucci at att.net]

I need some help with a very agravating situation. New client, Wurly spinet ca: 70's with the flat sliding key cover that folds over keyfronts. 
After removing the top part which was screwed in at both sides (the part with the music rack), I tuned the piano and replaced the top just as it was before.

That night I get a call from the owner saying , "You scratched up my piano!

I went back the following day and indeed the key cover is rubbing in several places. I drilled two new screw holes and tilted the cover back so as to not rub the keycover, but now I am faced with making repairs to said cover.

I don't do repairs to the case and am having trouble finding someone who does.
I could use some advice on this mess, and has this ever happened to any of you folks?
Also, to what extent dollars wise ,should I be held liable?

Thanks,
Rick Ucci / Ucci Piano 
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