Working with electrical wires can be a nightmare. End points fray and may not have a secure fitting when inserted into a terminal. The flight simulator will be using hundreds of end point terminals from the I/O boards (Output Amplifier) and ARINC boards.
There were accidental shortages to avionics in the past – this is an expensive mistake!
The simulator build has now incorporated the use of ferrules (idea initially from Flaps2Approach, thank you Ian). Ferrules are metal caps which come in a variety of sizes and can be crimped and cut to fit tightly into the terminal.
The end affect is a neat and strong arrangement of your terminal wires with minimal chance of displacement.