With the Boundaries defined with "Sharpie", magnifiers on, and a wickedly sharp carbide scribe, one can carve in a good etched "Crosshatch".

I've used this method for prepping a steel to steel epoxy joint, so far with no failures or come backs.

.....part of my "Belt and suspenders" approach to mounting scope bases on the hard kickers.

GTC

Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain