For this project, I wanted to do something about four rather plain-looking railing posts surrounding an interior stairway. The 3-1/4″ square posts were flat on top. I found some pyramid-shaped copper post caps that fit perfectly, and since solder bonds well to copper I knew the caps would work well for this idea. The copper backing also strengthens the glass so it is resistant to minor bumps. I used lead-free solder since many hands will be touching these post caps. The end result beautifies the stairway area and adds a unique touch of character to this part of the home.