I found this piece in a yard sale grab bag. What element(s) do I need to make this element function as it was originally intended?

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I found this piece in a yard sale grab bag. What element(s) do I need to make this element function as it was originally intended?
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Technic Turntable Large Type 1 Base (2856). It's a Turntable Large Type 1 Top (2855) which is part of Technic Turntable Large Type 1, Complete Assembly (2856c01). |
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