A bit naughty if the Person Who installed them didn't torque them down... Maybe he did and you are just a loose shooter! ;-)

I would use Blue loc-tite as anything else seems to need a bit of heat to remove..

This is grabbed from the EGW Web site

"Installation: EGW recommends 20 inch lbs of torque and a drip of blue loctite"

Good luck!! Post results of your groups when you get some.