I tried last night to push it all the way out with a pin punch (I have a lathe so could make a longer pin I could peen or stake) - it would only go so far and then it stops so it would seem it should not pop out.
Perhaps there is an indent on the pin that the spring sits in - not sure. Gave it a pretty stout whack and it didn't come out..... feeling better about it now.
I took mine out so i could bend the paddle more straight, i dont recall seeing any detents or other forms of retention. I believe its soley the fit and the extreme spring pressure that holds it in place. Squishing the spring and paddle back in place so the pin could go in was a real hair puller lol