Leezyjet,
I may have an answer there! Whilst working at Schiphol I needed to get hold of some ballast. One of my Dutch colleagues gave me a phone number and I rang it to be answered with....(in Dutch)..."ballast department!" Never found out where on the airport it was but ever since I've had visions of a man in a room stuffed full of sandbags waiting for the phone to ring!
PHX