What is this piece of silver aluminum?

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dh4664dh

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I do not remember what the silver aluminum piece is for. Does anyone know what it is?

It is knurled on the outside and threaded on the inside.

I am showing it next to a black AT 54mm aft closure.Motor_Piece.jpg
 
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Thanks.

I am not sure how it got in my box of AT stuff, but I have moved it to my CTI box of stuff. It looks much better there.
 
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