An opto-mechanical mystery item

[Michael GilliganParticipant @michaelgilligan61133]

[Michael GilliganParticipant @michaelgilligan61133]

Quite small, and very strange: **LINK**

https://www.surplusshed.com/pages/item/L14711.html

[quote]

Unusual piece. 17.5mm diameter pulley with center hole filled with a coated negative achromat lens 8mm clear diameter on one side and 4.8mm clear diameter on the other side. Not a clue what these were made for but here's your opportunity to get creative. We have a good supply of them.

[/quote]

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I just love Fred’s honesty

… but my ‘creativity’ is a bit low today.

Any ideas ?

MichaelG.

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P.S. __ my best guess is that it’s not really a pulley, but a flanged ring that allows the lens to be mounted in a self-centering clamp, like this: **LINK**

https://www.edmundoptics.co.uk/f/self-centering-jaw-clamps/39713/

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