Supra Sunsport 20V Owner's Manual page 52

Supra Tower
If your Supra model has been equipped with a tower, please review this section
for details on it's usage, maintenance and storage. The cage is designed as a stable
tower to enhance wakeboarding. It is NOT intended to be used to tow skiers,
barefoot skiers, or multiple wakeboarders. Such use will void any warranties
written or implied.
Before use, be sure that all mounting bolts are properly tightened in
place.
Be aware of and avoid low overhead objects such as bridges, power lines,
overhanging trees, etc.
Progressive Tower
To lower the tower, remove the hand knobs from the front of the
stationary arm. The tower folds backwards toward the sundeck.
To raise the tower, pull the tower up and forward until the forward
leg engages into the locating pins. Install and tighten the locking
hand knobs.
Hand Knob
To Raise Tower
• Lift the tower and swing up the rear legs. Install the four
hand knobs.
The threads in the aluminum foot could be damaged if the bolts
are not aligned and threaded correctly.
The tower is designed to pull a single (1) wakeboarder, trick
skier, or kneeboarder.
NOTE: Apply a thin coat of anti-seize to the threads of the
hand knobs periodically.
— 
To Lower Tower for Storage
• Remove the four hand knobs from the top of the rear leg
While holding the tower up, lower the side legs. Then lower
the tower downward into the boat.
20V Rail Tower
© 2012 Skier's Choice, Inc.