One day after cleaning salt off my 1UP USA bike rack I found that the ball on it was no longer retracting easily, making it hard to get the rack in and out of my hitch. I emailed 1UP USA asking for a few pointers on disassembling the retention mechanism and fixing it, but instead of that they sent a whole new hitch bar.
This evening I disassembled my rack to replace this piece, but then when cleaning the individual parts I found and was able to fix the problem. There is a plastic cap located in the part of the hitch bar that goes furthest towards the front of the vehicle and appears intended to keep from reaching the ball-moving mechanism. If this gets pushed towards the rear of the vehicle it can settle in behind the ball, preventing it from retracting. This was the problem that I had.
With the rack apart I decided to spend time washing the salt off of it, so now it’s sitting in the basement drying. I’ll get some blue marine grease (same as the rack originally used), put it back together, then get back to using it. I really do like the design of this rack. It does a great job of holding bikes in place and it makes it really easy to adjust two bikes to fit nicely while still keeping them centered on the vehicle.