Okay, time to necromance!
Same gun, same problem...
I tried the peening, and it worked for a while, but it, too, worked itself loose over two shooting sessions.
. In fact, yesterday, while shooting, it 'slid out' during a rapid-fire string. (No kidding). Now, it slides right through the dovetail, with no resistance from the sides.
So, does anyone have a better suggestion? Righ now, I'm thinking an epoxy, but that will be very permanent...
Kaso