A tuning body to be inserted into an electrical connector includes a base end and a plurality of ribs extending from the base end. The plurality of ribs is parallel or substantially parallel with respect to each other and is arranged to fit between electrical contacts of the electrical connector when the tuning body is inserted into the electrical connector. The electrical connector includes a first side wall, a second side wall, a first connector body arranged between the first side wall and the second side wall, and a second connector body arranged between the first side wall and second the second side wall. The second connector body is arranged a predetermined distance apart from the first connector body, and the electrical contacts of the electrical connector extend between the first connector body and the second connector body.