[Captainfab]

Where I see you are using two jamb nuts, you should only need one. With the rod end threaded into the tube, just locking one nut against the tube should prevent the rod end from moving. If you are still concerned about it, once you get your lengths adjusted to where you want them. Dis assemble them and add a little blue loctite to the rod ends where they screw into the tubes and lock them with the jamb nuts also.