I recently bought a new 87V and found that the mode switch does not have a white label. How could this happen?
Check out the Markal Paintstik B. Grab the white one. Practice on an old knob first.
I've used them to fill untold hundreds of lines on knobs, instrument panels, firearm serial numbers, etc., etc., etc., etc.
Some people call them a lumber crayon. Around these parts, they're a couple of bucks apiece at the hardware store. One should should last you for a very long time.
WoD