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Looks like a good bow-hold to me! You may find you get better balance by extending your pinky. I am pretty sure mind ends up on the screw, and is pretty straight. I was taught to start just as you showed, holding it with the thumb and middle finger, and then letting the other fingers lay naturally, except extending the pinky onto the screw (or however far it goes when mostly straight) for the counterbalance.
Thanks for the replies. My question is does it really matter where the thumb is placed on the gap or leather as long as you are comfortable & hand is flexible?
I don't think so. The important thing is that the fingers should hold the frog securely and the pinky should be behind the frog. The recommendation to place the thumb in the gap is a good guideline for the average-sized hand.
@bunify - I don't think so either but please take a picture of your bow hold so that I can analyze and make see that you are not doing anything that can be counterproductive. An image will be easier to judge.
This is how I hold the bow. My thumb is curved and sitting on the curved black part..
Hmm. I normally think of the thumb and middle finger as loosely forming a sort of ring, so the middle finger is close to the thumb and the ring finger is at the middle of the frog. The general idea is that the thumb, middle finger, and ring finger hold the bow, the index finger is used for leverage, and the pinky acts as a counterbalance. When your thumb is so close to your index finger, your whole hand is less flexible.
I probably should have mentioned this earlier; I just wasn't sure whether the pictures in the middle of the thread were pictures of your entire bow hold or just thumb placement.