If it's loose enough to where you can slide it easily, I'd peen it. Take the base out, strike it (dovetail) lightly with a brass hammer on both "sides" (front & rear), then drive it back in. Make SURE you don't peen it too much & to get the base centered properly when you're done. It would also help to CAREFULLY use a bit of glass bedding.
Sometimes you earthlings REALLY amaze me!