@Dorsey Pender I believe the two parts go together the way you have them at 0:20 in the video. As I buy/install mostly turret cameras, I haven't had to take one of these apart yet to be able provide further insight. However, I believe it's quite obvious the way it all has to go: Remember that the camera bends from looking straight ahead (just above the horizon) to 90º straight down on one axis. That will show you which way the slit on both parts needs to be oriented, to let the wire bend without cutting it. When that joint has the camera pointing straight ahead, the wire will pass straight through both of those pieces. When the camera is bent 90º looking straight down, the wire will have to bend through the cutout/slit in both of those pieces. From there, you should be able to figure out how those two pieces must be inserted into the camera body. If you get it wrong, the wire may resist the camera being bent all the way down, possibly mangling/cutting the wire if forced. If they're in correctly, the camera should articulate up and down without any resistance besides the locking detent notches.
@EMPIRETECANDY Anything you want to add or correct here?