Not sure that would be no dust but maybe good enough and certainly better than nothing. I was always using a vacuum too. The holes need to be brushed -- vacuum or not. I think there are commercial rotary brushes with high power vacuums attached that do this well. But man, cleaning the holes can be a pain. I was brushing till I saw no more dust and it takes a surprising amount of brushing to get there. Maybe that was due to low light with headlamps so you could really see any small amount of dust coming out into the vacuum stream. Hole drills were quick for me. The clean outs ... not so much.
Blowing hte holes out is much faster than vacuuming, because the air velocity and volume are much higher. Even sticking a straw down the hole and using your longs works, because all of the air containing dust is moving out of the hole. . You can vacuum the stuff that comes out when you blow, to keep the dust down.




















