@johnb , Essentially there is a self centered magnet carrier that snaps onto the throwbar, and another that snaps onto the ties (they can be glued on and the snap heads snipped off if you don't like the looks, see below). The spacing between the magnets under the switch is equal to the throw, so when the points are pushed in one direction or the other, the magnets attract and hold the points to that side. The system requires a small divot in the roadbed below the throwbar for the parts to clear and operate.
By inexpensive in my original post, I meant compared to the cost of servos/wiring/controls, etc.
Here are the installation instructions. These instructions show me using CA, but I do think a good thin epoxy or UV resin glue would be best. CA tends to dry out and let go of very smooth surfaces over time.
https://photos.app.goo.gl/pcNxMnvBqHpfhNs18The kits come in four packs and come with optional pneumatic switch machines that snap on either end of the throwbar for left and right MOW positioning, that can be used as a push/pull if you don't want to put your fingers in the points to move them. Each turnout requires four magnets of the same size. The magnets are purchased separately and are linked on my website listing, as are the same instructions linked above:
http://www.keystonedetails.com/keystone-customs/2021/2/6/4-pk-n-scale-atlas-custom-line-magnetic-turnout-actuator-4me5z
After painting:
