Here is how a community works, I love this, had a couple of people who bought my Garmin Varia Saddlebag Clip and was not happy with it. I asked if we could email back and forth to see what could be done to improve the hold of the clip. One suggestion was to include a larger more pronounced hook end under the bottom of the clip. the other asked for a slot and provided a drawing that I have added here;

It was a great idea to make the clip even more secure. Now you can use a Zip Tie to further fasten the clip to the back strap of a saddle bag. Also, if you need/want to tether the Varia to the clip, there is a small hole for that too.
Garmin Varia Saddle Bag Clip