How to stick a metal washer to the back of an iphone 4?

I got a fish eye lense for my phone but i lost the adhesive metal washer how do i stick a normal metal washer to the back of my iphone 4

Contact the maker of the add-on lens and buy a new washer.

The washer that is used by the add-on lens has a specific thickness. Trying to use a different washer will probably cause your camera to take out of focus images

With superglue?

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