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This right-hand problem is the opposite of the "airplane strut" straight little finger, usually the product of the thumb pressing and collapsing inwards, and some inward wrist rotation. Both these flawed positions are commonly seen in beginners, and often in trying to correct one extreme, the student adopts the other one! Emphasize balance of index finger/little finger/thumb, and the idea of three "force fields" established by these (using the string as a fourth), "trapping" the bow, rather than images of "grip" and "holding."