[Nonfractal]

I find a smear of thin superglue worked into the body post with a pin works well
Allow it to dry thoroughly then gently reinsert the screw a turn at a time, backing off half a turn each time.
Collared screws are a good upgrade, NSR or slot.it brass are my go-to screws.

The nsr screws have threads cut into the shaft diameter, the slot it screws have threads larger than the shaft diameter.
Try nsr first then slot.it. 
AlanW