Macro lens with a magnetic fixation
thingiverse
You can find an upgrade of this thing at https://www.thingiverse.com/thing:3188854. Here's a simple way to put on and take off my macro lens from my underwater camera with just one hand. I'm using small magnets that are 3mm in diameter and 2mm high. Check out these tiny neodymium magnets available at https://fr.aliexpress.com/item/100-Pieces-Pack-3-2mm-Magnetic-Materials-Neodymium-Magnet-Mini-Small-Round-Disc/32805599803.html?spm=a2g0s.9042311.0.0.JuXf2o. They're perfect for this job.
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