Over over puts multiple same direction twists in the cable. Over under puts a twist, then puts the opposite twist, so you don’t have to unroll the cable (or otherwise remove the twists).

Here you go:

with-lock-ex -q /path/to/lockfile sh -c '
while true; do
    crontab cronfile;
    sleep 60;
done;'

That’s why there’s a crontab rule to load the crontab from a file. Cronception if you will.

The outer contact is ground, the inner pin is for locating (unconnected) and the other three are X, Y, Z. It’s a Nema SS22-50R.