Place a drop of high strength thread locking compound (e.g., Loctite 262 or Vibra-Tite 137) on the tip of a short retaining screw.
Tighten each screw with a torque wrench to 62 inch-pounds of torque. This is the about the same as 5 foot-pounds of torque. It is a tiny amount. Do not over tighten!