I am mounting a handrail to some steps and the bottom concrete area below the steps. I am having an issue with getting the set screws to tighten to the metal post that goes into the flange bracket. I have included a picture of the flange bracket. It will tighten but with very little back and forth movement it becomes loose again. Two set screws to flange.Only on side seen. Any suggestions?
Here is what the bracket itself looks like including the two corner set screws: