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I’ve seen those and quite like them but my only misgivings are they are quite low and hold the light vertically (which I think impairs the side visibility somewhat..?). Also feels a little exposed I reckon he could break it resting his bike up against something.
I was thinking of getting this
https://www.orrobikes.com/shop/orro-seat-clamp-with-light-31-8mm
(edit, actually I don't know if that orro built in light is removable)
Mounting a flat bar to the hole (countersunk screw so it’s flush) drilling 2x holes at the correct spacing and going with that.
Or adapting a moon clamp I have that attaches to the saddle rails.
One of these little dudes? https://fairlightcycles.com/product/dynamo-rear-light-mount-drive-side-retail-stock/