Wow, yeah you need spacers or washers on the actuator tube end and center clamp. Also, it HAS to be installed in the same "plane". That means if you have the middle (center) of the tube brace UNDER the polar mount (as you do above) the END of the tube also must be installed UNDER that brace. Personally on my Sadoun 6 footer, I installed them both on top. The way yours is, the first time you run it hard East, it's likely going to break in half and dump your dish.
I also suggest installing bolt DOWN, as if the nut ever comes off, the odds are the bolt will stay in and keep it from dumping. If you nut came off (unscrewed) now, you'd lose the bolt, and your dish will take a header into the ground.
P.S. What happened to your nylon inserted locking nuts on the mount pivot points? They seem to be missing, and you've replaced them with standard nuts. After running your dish back and forth a few times, your nuts are going to unscrew themselves...
Ok, I'm going to suggest you do a search on satguys for others that assembled and installed these dishes, look at their pictures, and COPY THEM! That's what I did, and it made a serious difference. There are some very good threads here with many pics of this exact dish..
http://www.satelliteguys.us/free-air-fta-discussion/192045-sadoun-sd180g-review.html (ground mount, but good info)
http://www.satelliteguys.us/free-air-fta-discussion/192603-sadoun-1-8m-polar-mount-assembly.html (SERIOUSLY good post for this exact dish!)
I highly suggest you study this site here, and it'll help you understand what you need to do:
http://www.geo-orbit.org/sizepgs/tuningp2.html#anchor469886 Some info is quite old, but it's all still valid for what you need to do to get this installed properly.