This is my second hammer. I use them to install retaining wall blocks on top of the main course. First, a round part wore out and fell off, revealing the container that holds the shot. I blamed it on wear and tear until I saw others with the same problem. However, I bought another one. This time the pen clicked on the head. I am a homeowner working on a project that failed. In fact, I bought a third one as a last resort. The third was structurally exactly the same as the second. It also broke…