As a new tractor owner, I bought a quick hitch. I just added the bushings to the box blade and can't get it to seat properly in the hitch. At all three points, I'm bout 1.5" out of the seat. As a result, I can't lock the bottom pins in. Problem is with the top hook not dropping past a spot. Geesh, I bought this cuz I wanted to save 10 minutes here and there. I have used quick hitch successfully numerous times on mower. First time using the box blade. Do I just need a bigger hammer?! 