I found i had to change my open bridge because the tension holding my thumb up was causing discomfort at my wrist. Fortunately my hand is shaped in a way i can bridge well using the knuckle of my thumb. Lets me keep my hand much more relaxed.
Before:
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After:
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Thanks for sharing those. As I also demonstrate in the video, bending the thumb down can create an adequate "V" facing the shooter. As I mention in the video, each individual needs to find what works best for them as an individual.