[EdZ]

In a 'true' swing the rotation can just happen, thanks to CF and the throw out motion of the pivot. The motion needs to be on plane, and in rhythm.

Most of the time, all but the truest of swingers need to have an action to start or cause the release, to allow it to happen.

Automatic release types can work nicely as well, although I personally find that an automatic release and a 'true' swing at the least have different feels and/or intentions (automatic release for me is a focus on aiming point, vs giving up control to CF in a true swing).

All of that said, you will be in far better shape if you learn to feel the rotation of #3 by doing it actively at first. For many, quite literally as hard as you can rotate it. Try to hook the crap out of it with the left wrist.

you will

Then you can learn the rhythm. The left wrist staying VERTICLE to the ground - which prevents you from having a swivel as hinge action, and no chance of consistent results.