After four years, my goofy system is still working great; no corrosion spots, and the railings are still as tight as the day I put them on! I used Rivet Nuts (#8-32 thread size) and put a nylon washer ONLY below the railing posts. The idea is allow water to flow between the post and deck, preventing crevasse corrosion.
There's details of all this on the Repair Website.
Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell