To date, we know of one instance where the user had lost the screw, and the lever along with it, he did not use thread locker on the screws.
In addition to what's known, there was an unknown variable: the amount of torque applied to the screws. Both the screw and lever were replaced at no charge.
We have instructors/dealers that purposely leave the screws without thread locker, as they need to be able to swap them out for their customers / students. Tens of thousands of rounds later, the screws have not come loose.
This is not to say that one should omit the use of thread locker, it is recommended to use thread locker on the screws, but it does demonstrate the benefits of using the Torx screws, which allow more torque to be applied.
Roger Wang
Forward Controls Design
Simplicity is the sign of truth
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