Summary

Remix of the binocular mount, for a 37 mm stem, 14mm diameter (resize for your binoculars) from https://www.thingiverse.com/thing:3668292 from which i borrowed the idea, even though there's other similar designs. It's more simplistic in shape as i couldn't bother doing the exact with measurement, my old binoculars 8x is some old no brand and needed to rest on the mount to not wiggle.

The mountbox for the samsung s20fe ( also posted here https://www.thingiverse.com/thing:6462897) is superglued to the mounting piece to the binoculors and is only one as it does the job and sits well. Make sure your eyepiece is 37 mm. Its separate as it will make it easier to adjust for your binoculars. all made in tinkercad as can probably be seen.