This is not a problem as long as you have the vault door open when you are setting and testing the new combination. What you don't want to do is shut the vault door and reset the lock before you verify that the combo is set as expected.
A good place to start is with an Elmer. Short of that a screwdriver is worth considering. https://www.tarheelantennas.com/mobile_antennas has good pointers on placement.
Grounding straps and filters will be your best friends. Tuning is a must. On the lower bands you will just warm the coil...
I have no idea, but coincidentally they are in exactly the right location, size and shape to secure the rear glass power and fluid line connectors when I take the top off the rig.
I had a similar problem when I woke up Sunday. Time on my iPhone and computer were off by an hour from the clocks on the microwave and stove. I have no idea whats going on.
[Opinion:] It's not "If you should" it's "How long should you". [End of Opinion]
You do you.
For those that want help doing their own research, here's a Starting Point
-Guess-
"Brake controllers send a small amount of voltage along the brake output wire, if a trailer is connected, the magnets in the brake assemblies [OR your "Backlight"] will create a power draw. This power draw tells the controller that a trailer is connected."
If you have a power draw off...