How do I spawn the watchtower? I spawed it by duplicating the needler, then used entity BSP viewer to move the two sections to the desired location, and then in the game it kept respawning "new" towers (I only need one!) until the map froze

I really want to just say hey spawn once, be at x,y,z, and be able to use it as though it were part of the map.
Thanks,
-Schmoozer
