Pivots and cup?

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Three pivots and one cup? (that fits into the centre of the compass) for the dry card compass card.

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ID:	ACO1021.2
Type:	Pivots and cup?
Display location:	Not on display
Creator:	Unknown
Date made:	circa 1879
Credit:	National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements:	Overall: 1 mm x 38 mm x 1 mm
Parts:	Compass card Compass card box (ACO1021.1) Pivots and cup? (ACO1021.2)