Originally Posted by andyo5

Maybe using enough torque is the answer. There are inexpensive torque wrenches on the market, calibrated in inch-pounds. Once you have the magic number, you could repeat it every time.
What does the owner's manual say about this screw?

POSTSCRIPT: I was able to view the manual online. It says to tighten the screw until it is 'snug'. And it advises to periodically check the tightness of the screw and tighten as necessary. I suppose this means keeping an allen wrench in your range bag and checking the screw before and during shooting.