Set down a control board and battery. Connect an extender and RAD to the axle you want loaded. Wire the original axle and RAD to rotate when you press ___ button.
1) Hold the button down for 3 seconds, then swap to another tab on the top once.
2) Keep swapping between tabs, but this time, swap it after holding the button for not even 0.5 of a second.
3) Do this until the axle is out of place, and you can attach whatever you wanted on it.
If you don't hear the RAD squealing, then it's not going to axle load, and you'll have to redo the process from the first point.