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I used Locktite and had no problems, but the stress on my ring is minimal. For harder use I would probably put clear epoxy over the screw head and where it meets the plate. This would hold it in place, give indication if it moved, and avoid some fancy welding. Otherwise, I might look for, or have made up, a one piece unit.
Bob
Manta/Highseas makes some really nice-looking welded ones. They're just dang expensive....