Next you will solder the wires to the two contact points designated in on page two. The polarity of a crystal does not matter, so you will not have to worry about not getting the polarities correct. Unless you are going to cram the crystal inside the case, you will also need a small pin vice or hand drill to drill 2 small holes into the side just above the link port for the wires to come from. The section cut of of the processor heat sink is not neccessary, it was the space for the crystal to be inside of the case before I found out that a cartridge could not be inserted with the crystal in that location.
Next you will solder the crystal to the portruding wires. Congratulations, you are done! I bet you are thinking, why didn't I think of that? Too late, I already have :)