What is the rectangle hole at the front of the RVR pate for - right next to the connecters? It appears very purposeful with the four screw down holes on either side, but I can’t figure what its intended for. It certainly is in a very inconvenient place when was in trying to mount sensors and cameras and the like on the RVR.
Oh, well spotted! What size servo is that?
I would like to say it’s the standard size servo but that is some what diluted these days so the servo I have has Dimensions: 2.2 x 0.8 x 1.6 in (55.8x 19 x 40.6 mm) excluding servo horn.