Anyone using a lazy Susan with their electronic board?

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GeorgeGoodnight

If so, can anyone recommend  one please? I have a DGT Smartboard. I know you can get plastic ones, but these do have steel bearings. They are only small so may not have any impact. 

This guy is using an aluminium one: https://www.youtube.com/watch?v=yWQgM0po0V8

Is it just ferrous metals you have to keep the boards away from?

Thanks so much.