Love my GSD shelves and have a ton of them. I only used the pins on one wall where I joined sections together over 6 feet.
I set the pin on my bench vise, add a drop of oil, and pound a punch (NOT a center punch) down into each end to spread it open. Then tap the pin onto a shelf while standing the shelf on the floor. Concrete, NOT wood or tile.
Then once you have both shelves mounted to the wall, take the same punch and drive it onto the other shelf.
It is a bit tedious, and I did break a punch in the learning process. Like any project, once you learn the tricks of the trade, its a piece of cake.
