This is a simple mount that attaches to the top of the Arrma 4s RX box. It holds a Hobbywing ESC power button and the AGFRC V3 aluminum gyro. There is also a version that just holds the Hobbywing button. Normally it's a press fit, but you could use glue if the fit is too loose. If it's too tight, try printing at 102% in your slicer.

Link to ESC mount (shown in the photos) - Link