Great work and photos!
Place a laser level across the face of the feedhorn, centering the laser in the scaler opening. Adjust the legs, scaler hardware attachment points until the laser points to the exact center of the reflector. Insert the feedhorn and rotate so the arrow is at 90 degree angle to the dish vertical. Place a laser level across the face of the feedhorn, centering the laser on the feedhorn throat. Adjust the feedhorn FD setting and level the feedhorn within the scaler until the laser points to the exact center of the reflector.
Now it is time to mount the dish on the pole and set the dish angle, declination angle and set the jack with east / west limits.
This brings back some memories, I had a feed cap with laser built in, I was able to use it on any feed, it was pretty cool, mite be a good thing to include with the dish or sell on it's own. I think somebody stole mine