Just changed the clutch slave cyllinder on my 77 40. This is the only project I have ever done that took the amount of time everyone said it would! Took me 2 hrs (I'm not a great wrench), including bleeding with a Mi T Vac hand bleeder; also new to me. My question is, with the hand bleeder, I went through about 50 pumping cycles and 5 cups of fluid but still had some air bubbles. The direction says you will continue to have "small bubbles" that sneak in at the bleed screw. I got about one bubble per second when pumping, approx. .25 inches in length inside the hose. Started getting all new fluid through the hose; felt like overkill effort put into it. Do you think I got all the air out of the system? Is this an acceptable amount of bubbles?