I know how frustrated you must be, but what I see is......................All of the slop appears to be within the bearing itself. As you wiggle the shaft all the movement seems to be on the inner race and very little movement on the outside of the bearing where it contacts the mag. I would remove that bearing, clamp it in a vise and wiggle it around again. Chineese bearings are really junk and if the bearing has not spun in the mag and ruined that surface you should be OK. If the inside of the mag is a little scratched just wipe some JB Weld around on the surface before installing a new higher quality bearing hopefully made in the USA.