Things you'll need
small wodden box to hold the shakuhachi in place while working on it, (easy to manufacture yourself)
many many different kinds of files, very long hand drill bit, long file.
strong thread for binding (prevents cracks)
urushi laquer (toxic, but you can use normal boat laquer instead)
a piece of bone or similar, for the utaguchi (mouth piece)
Madake bamboo (I puchased mine , with a certificate of authentication from japan) approx. 200dollar
Step 1: Step One Beginning
start pruning the root, and filing it down.
Then drill with hand drill through all of the membranes inside, this will take long time, and after that file with file so the inside is
Step 2: Filing and Cutting
Once again im sorry for not remembering the mesurements , you can search shakuhachi holes mesurement on google and if you find monty's shakuhachi site there will be some there
Step 3: Step 3 Binding
I used traditional strong thread (cant remember its name) and I bound it on several places as seen on the picture,
take it very slowly here cus you don't want to mess up.
After the binding laquer it generously with urushi laquer especially the root part,, and the bore, and very lightly on the utaguchi, then laquer the bindings as well
Step 4: Finished Product
Happy playing :D