https://www.etrailer.com/tv-demo_thule_snug_tight_lock_STL2.aspx
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
This lock is for carrier to receiver security. We’ll show you how it assembles first, then we’ll show you the lock applied to a bicycle rack. Before we can install the lock, there is a little bit of assembly required. First you have to open the hatch so we can insert the core, then you take off the back plug, and then we take our core and put our pass key in. After the core is secure, test the lock with the other set of keys. Now we’ll try it on the pin. Since we have a bike rack installed on our two inch receiver, we’ll show you how this works. Basically there’s a lock washer that goes on first, then the flat washer. This is just like a regular nut and bolt assembly. Go ahead and install it to your bicycle rack. The kit provides you with a tool to snug it down with. Then we install the lock on the other side. There you have it, even if they unthread the bolt, they still have to get through the lock and they can not get the rack off. There you have it for part # STL2, the snug tite lock from Thule.
FORGING HEXAGON HEADED BOLTS FOR A SWEDISH NUCLEAR POWER STATION