Now enjoying 2 PS Luxury Twist Flakes in the Vauen Olaf bent egg with 9mm filter after fully reaming the pipe. Yesterday it wouldn't take one full flake. I learned what happens when cake builds up too much ... the pipe doesn't smoke correctly, there is barely any tobacco flavor and it clogs easily, I had to use the Bittner, a drill bit, and the Wharncliffe blade to break through a ridge that developed just above the draft hole where the Bittner wouldn't reach. Not gonna let that happen again ! The wharncliffe pen knife blade works very well at reaming by the way. Live and learn.