That control only really should be rotated, Think of it more as a pole, because it does control the humerus and if you don’t want to rip the bone out of its rotator socket then you should just use the hand paddles. the whole point of ik is to have just one control, like the hands, and then tweaks some poles
If you really want the fine control of the Fk just pull up the sidebar, and pump the ikfk value up to one and use the green widgets to precisely fit your gesture
I recommend you play around abit more to see what everything does, you can always reset the bone positions
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