Digital Calipers "Switch"

I got tired of opening my "precision stuff" drawer only to find that the battery had once again died on my calipers. Off I went to Onshape, and a few iterations later I had a good design. I figured I would share it, only to see that someone else had beat me to it. 8 years ago:

https://www.thingiverse.com/thing:1734129

Oh well. I think mine is a little better anyway, so I here it is. Like above, my original design could freely slide all the way out, meaning I would lose it. I wanted it to stay reliably inside the calipers, like part of the tool, so I came up with a couple of ideas:

FIN.STL - This is the one I use. Due to its geometry, you kind of have to force it in, passed the "fin," but once it is in, the fin holds it in place every time, and there is a satisfying stop where the device stays in the open position and does not fall out. I would have to pull it pretty hard to get it to pop back out. I don't even use the ON/OFF button anymore. In the ON position of the switc