Truss rod rescue!!!

Found this terrific unserialnumbered ibanez lp, was basically fretless, so I got it cheapish. Spent a fortune giving her jumbo ss frets, had it home for two days of awesomeness, and the truss break. The PAIN! Then google gave me this repair kit hit. To my question:
This thing only work on the single action rods, and I have no idea how to tell the difference between single and dual action. Anybody know what I got, or how to figure it out?