pull, drag, right itself
扳 centers on using force to move something toward oneself or back into place: pulling, dragging, or righting something that has shifted.
扳 combines 扌 (hand) with 反, which likely contributes both sound and the idea of pulling back or reversing. The exact historical development is uncertain.
A hand 扌 beside 反 (oppose, return) suggests pulling something back against resistance. Imagine grabbing a heavy object and dragging it toward you.
For ハン, picture a hand pulling a stubborn mule: the mule brays 'han!' in protest. The sound 'han' cues ハン while the hand drags it along.