Last time I was looking for one, I discovered the local scrap yard had quite a stock of them. They were taking them off whatever was in the yard, and when there were too many on the shelf, stripping them for the copper windings. It was much less hassle for them intact to sell than strip down! If it didn't work, they'd swap it for another. It sounds worth a try if nothing turns up cheaply on fleabay.
Simon.
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