3 point adjustment

I have been using my rear blade tilted to crown the driveway. When I adjusted the lifting rod to tilt the blade I went almost ½” beyond the groove on the bottom threaded rod and still did not see the groove on the top threaded rod. Since I had the blade on, I limited the tilt to the groove on the bottom rod. Today with the blade off I unscrewed the lifting rod and found the top threaded rod was screwed into the nut an extra ½”. To put it back together I started the upper rod one thread into the nut and then started the lower rod. With it assembled I now have an extra ¼” of extension at the lifting rod and this will tilt the lower end of the blade an extra ¾” inch down.