As apost script to the above....The video gives a very clear view of the position of Clive Bell's shakuhachi. As a soon to be taught, but up until now self learner, I studied that position on myself in the mirror and found that a small adjustment had to be made to mimic the position Clive Bell uses. My upper end kan is now much clearer, and meri a bit easier. Millimetres....micromillimetres!!!!!