Do you mark your stem/ bar interface to remember the positioning?

[Veloo]

The mention of the Zinn stem in the coupler build forum just had me wondering - and the mind is straying a bit as I work on yet another spreadsheet here.

Do you mark your stem and bar interface to remember your position? Not all bars have effective markings and even if they do, the stem usually doesn't have anything to do a relative position.

I used to use a dab of white-out but that wears off over time. That would also help me see if there was any slippage after doing and removing and replacing.
Don't use anything at all anymore tho.

So if you do, what's your method?