Despite the coupler being inside the car for only a month, the steel surface developed quite a bit of rust. It was always the intention to take out the coupler and apply a protective coating, but I wasn't expecting just how fast the rust would form... (Especially in Phoenix!)
Taking apart the coupler...
I used Rust Dissolver jelly to clean up the parts.
Once all the rust was removed, I applied several coats of Rust Inhibitor onto all the metal surfaces.
The pieces look shiny and new once again!
Similar to the adaptor plate, the coupler is held together via a lock washer, a regular washer, and threadlock fluid.
I'm aiming to get it back in the car tomorrow!