I used to use Phil grease, then hand the bike drive side down over the bench vise, grab the cup with the vise jaws, then tighten using the frame as a good sized wrench. (I love left-hand drive side threads. So much easier.) I never had a vise tightened French cup loosen (and they were on a UO-8 that did a few 100+ mile rides as my fix gear training bike in my racing days),