As I commented earlier, why would you want to run a JD head, they are worthless, pieces of junk, sell the stupid thing to some poor JD lover, then go buy yourself a good Gleaner table, you'll thank me for it. The JD heads have no flex travel, JD has 3.5" compared to 6" or 7" for the Gleaner. I have used both, I am the voice of experience, the JD heads are woodchuck killers. Instead of going over the mound the JD cuts it off.