Take the push button release rod out, and use the stock wrench to tighten the guide to the iron. To do this you need to push the button in slightly to expose the small set screw which holds it in the forearm iron. You will see a small hole from the top of the forearm just in front of were the lug of the barrel fits into the iron. It requires a very small, preferably magnetic, thin blade screwdriver tip. Once the button and spring are removed, you then can insert the stock wrench into the guide and turn the guide clockwise to tighten the iron to the wood.