Step 2 — Install The Connecting Pins
Once you are certain all of the blocks are aligned properly, begin inserting connecting pins. The connecting pins have two holes at the top which are used to tighten the plug. Rotate the top of the plug so that it is roughly 45 degrees to the block, and press it into the hole. The pin draws the blocks tight and holds them in place. It can be pounded into place with a tamper, or by stomping, but be careful to hit the plug squarely to prevent damage. Leave the inserted connecting pin at 45 degrees until all of the connecting pins are inserted.
Then, tighten all pins at once ensuring they are all facing the same direction.