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It is a very tight fit and a high quality print. Better grip on it than the decent stock exposure mount. As a comparison I sometimes run the stock mount and light inverted on other bikes and it hasn't fallen off either.
~20,000km over the past couple years with the skunkworks and it hasn't come out once.
On the sirus light, I did do a 600km audax with it as my only light in 2019 without issue. Plenty visible.
I've seen similar with GoPro attachments but are you not afraid it might drop if you hit a pothole or something like that?