Send a group of D.T's and place them just out of the range of a laser/component tower and line them up with the defense structure. Force fire in front of the structure and the disks will bounce into the structure. Even though its not as accurate, the laser/tower won't shoot you. You can use this in many situations to increase the attack range of your Disk Throwers.

Tell a Disc thrower to force fire someplace. Then when he is about to throw tell him to fire across the map and he Will. Those Arms must really be good.