Sorry to hear about Luuk Goldhoorn.  He's contributed a lot of knowledge
to the music box field that will be read for many generations to come.

In looking for something else, I came across an article on a sur-plateau
watch movement that he wrote.  I had thought his major research focus
was in Austrian musical movements, but it just showed how diverse his
inquiring mind was.

Nancy Fratti - Nancy Fratti Music Boxes
Canastota, New York
http://www.nancyfrattimusicboxes.com/