Elevator
servo installation.
Rudder control lines.
The slots in the covering are done with a small soldering iron.
A tough edge is
formed by the melting action so the cut does not run on later.
This is a Lemon 6 channel Spektrum
compatible receiver, it just hangs from the wiring. http://www.lemon-rx.com/shop/
I have 4 or 5 in airplanes and
they have been very reliable even at long ranges.