Basically, I think you have the gist of it. I haven't by any means done research or anything like that aside from being a armchair mechanical engineer. There can be other issues at play: thermal expansion, vibration, etc that can cause things to loosen as well.
An alternative to the pigtail idea is to use a crimp wire pin. The crimp being designed to apply the constant mechancial force necessary to hold the different wires together, and the single pin to be held in place with the screw terminal.
An alternative to the pigtail idea is to use a crimp wire pin. The crimp being designed to apply the constant mechancial force necessary to hold the different wires together, and the single pin to be held in place with the screw terminal.
