MOTM

>A few months ago I spent a good couple hours trying to find an >OEM supplier for piano key assemblies.

My understanding is that most of the world's keyboards are made by Fatar:

FATAR srl
Zona Ind.le Squartabue
62019 RECANATI (MC)
ITALY
TEL +39 071 7506078 - FAX +39 071 7506142

I can't find a webpage for the main facility but here is their USA office (not their OEM business):

http://www.studiologic.net/

Ivan