I'm speaking for another weak-wristed cohort -- the elderly -- and I recall being a spindly preteen facing the same challenge. Manufacturing adjustments might work. According to one study, "The Twisting Force of Aged Consumers When Opening a Jar," if less torque were required, specifically 2.0 N·m, then "97.6% of adults aged 50–94 would be able to open vacuum-sealed jars effortlessly." Applied Ergonomics (2002) 33(1):105-9
I'm speaking for another weak-wristed cohort -- the elderly -- and I recall being a spindly preteen facing the same challenge.
Manufacturing adjustments might work. According to one study, "The Twisting Force of Aged Consumers When Opening a Jar," if less torque were required, specifically 2.0 N·m, then "97.6% of adults aged 50–94 would be able to open vacuum-sealed jars effortlessly." Applied Ergonomics (2002) 33(1):105-9