Intent: Easy on/off without removing rack and secure. Items needed: Pelican case Clevis pins with locking pins (x2) Rubber o-rings (x4) Washers Step one - use your top rack as a template to drill holes. Check desired depth of Clevis pins and cut to size. This will allow you to come from underneath your rack to install without having to remove the rack from the bike. It also prevents would-be dirtbags from taking your stuff. Step two - reinstall rack and mount the pelican case. The rubber o-rings will allow the Clevis Bolts to stay in position while mounting. Use the second pair of o-rings, washers, and locking pins on the interior to get the desired snugness.