I’m sure this is the millionth thread on the subject already, just didn’t find many that touch it from the same angle…
Practicing with just the bachi so far, the pinky seems to be the challenge. Other fingers mostly fall in place… or so I think… though sometimes it feels the middle and ring ones are too short to wrap around the bachi.
Following Kyle’s instruction, the first challenge seems to make your pinky bend nicely. Once it bends, there’s the challenge of placing it properly - I take it should be always the middle section of your pinky that rests against the bachi, while the root section and the tip section (thinking of the finger having 3 parts separated by joints) are not really touching the bachi? I think actually resting the joint between our root and middle sections against the middle of the side of the bachi could be a stable (and relaxed position) as well.
I’ve noticed there seems to be several ways how to hold a bachi. There are some creative ways to place your thumb and index finger. Also in the pinky part there seems to be a difference between the Kyle (and Kevin?) “tiger claw” way referred above where the pinky separates and at least some japanese players who rather rest the root part of the pinky against the bachi using a “drooping pinky” way where the rest of the finger is just pointed downwards.
Chikuzan Takahashi II (?) seems to change her way of holding the bachi for a different technique: http://www.youtube.com/watch?v=pyUCyp7tzec
Found also this nice explanation: http://www.shamisen.info/ehikikatasan/kotonosoho.html
I think just practicing relaxed holding of bachi is worthy of attention, initially it seems I get quite a stressed grip compared to what’s the ideal, even after holding feels stable and I start to relax a bit.