I'm a pilot and an I.A. and I always use it for cylinder hold down nuts on Lycomings and Continentals. An added bonus is it makes it look real professional too. Nice video.
Good stuff, I'm a mechanical engineer in the automotive field, for the last 28 years, product development engineer, proving grounds, we call it 'Paint Scribing' and will use different colors for different visual references. We use paint pins for uni-paint.
