
Drill the holes to 3,2mm and use a Dremel for the other stuff.
File down the outer chamber to half of the material thickness.
Put the outer chamber on a drill for this to make it thinner.
Air bubbles come up imediately now even with 30/70 and -8 degrees outside.
Cotton is wet like a virgin - tastes like a Dripper!
Edited on 2/9/2017 at 3:58 PM. Reason: