The UP5 sits neatly below the Universal Fighting Board, attached to the caddy using a small hex screw (included). Additional long hex screws and nuts keep the UFB connected to the caddy. If your Fightstick already has pre-drilled screw holes for the UFB PCB, you can install the caddy in this manner:
First, screw the UP5 into the caddy using the smaller hex screw and hex key (included).
Next, screw the longer hex screws into the case's PCB screw holes, then into the long columns of the caddy.
Finally, attach the UFB to the top of the caddy's columns, securing it in place with the included screw nuts.