#6 isn’t for the thumb, it’s so guitar players can move their fingers over the strengthen and stretch their fingers. It works especially well to get the pinky to spread and apply pressure
“The handles on my kitchen counters are hard to grasp, hard to clean, and have a recess at the bottom that attracts crumbs and dust. There are 14 of them!”
#6 isn’t for the thumb, it’s so guitar players can move their fingers over the strengthen and stretch their fingers. It works especially well to get the pinky to spread and apply pressure