Jandy pool company "mini jet"

My pool has three Jandy mini jets around the edge of the pool (down by the water, not on the deck),

Not the deck jets, the mini jets.

zodiacpoolsystems (dot com)/Products/Water-Designs/Minijet.aspx

They throw a real nice clean arc at least 15 feet - and once when we turned the pressure up too much they shot over the neighbors roof!

Anyway, I looked at the details and there's nothing really earth shaking to the design.
Just a hollow box fed by your pool return (or water feature pump) with a nice brass tube/nozzle.
The nozzle is on a ball joint so you can aim it.
There is supposedly an adjustment that you can adjust with a special screwdriver tool through the nozzle, but I didnt see any change.

Anyone know they're secret?