This was made so the supplied antenna cable for the DHT internal FrSky module can be mounted onto the top of the Turnigy 9X. This allows for easy removal of the antenna. The bore has been made wide enough to fit the 5dBi frsky antenna. I hot glued my cap onto my radio to make sure it wouldn't move. Its a very tight fit but I wanted to make sure it wasn't going any where. I printed mine with 3 shells, 15% infill, .20 layers and supports. took about 20 minutes at 30mm/s on my printrbot simple.