I've tried the 6 holed and the 6 slit stem without the beads, the 6 slit was by far the smoothest draw of the 3, I had the water half way up on the water level guide and at 280°c with the ruby twist ball injector and standard glass bowl. I'll try the beads out in the stems tomorrow, same temps, amount of water, I'm not sure how many beads to put in but would Imagine your just covering the holes or slits with them, I will double check on one of his vids on stems and beads Lee has put up just recently over the last couple of months.